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Duckweed lemna Stock Photos and Images
RMC91H50–Well at a rock at Monasterio de San Juan de la Pena monastery Sierra de San Juan de la Pena Province of Huesca Aragon Northern S
RFJ2C7H1–Western Australia, Broome. Malcolm Douglas Crocodile Park. Saltwater crocodiles (Crocodylus porosus) in duckweed covered pond (introduced species, Lemna minuta). (Large format sizes available)
RFJ0DC9K–The lush greenery coveres the ancient objects of Polonnaruwa archaeological site, Sri Lanka.
RFW8RDC0–The Irpin River, northwest of Kiev, Ukraine, is covered with green Lemnoideae, also known as Duckweeds or water lenses, during the hot summer.
RMDNPDNG–A woman travels on a boat across waters covered with lemma plants in Congo Mirador village, Maracaibo lake, Venezuela
RME15NAC–Australia, Western Australia, Broome. Malcolm Douglas Crocodile Park. Saltwater crocodile (Captive: Crocodylus porosus).
RMEYKP55–Germany, Mecklenburg-West Pomerania, island Rügen, Sassnitz, Jasmund national park, Buchenwald,
RMF32E2D–Spraying with chemical weed killer to clear Duckweed which is a rapidly spreading aquatic plant that deprives ponds of oxygen.
RMEYKP2A–Germany, Mecklenburg-Western Pomerania, Fischland-Darß-Zingst (peninsula), Western Pomerania Lagoon Area National Park, Darss (peninsula), Darsser Wald (forest),
RMAEBWRF–The French Marais Poitevin near the village of Coulon (France). Le Marais Poitevin à proximité du village de Coulon (France).
RM2AJEHT0–Elementary botany . takes place through thoseparts in contact with the water. 51. Absorption by the duck-meats.—These plants are very curious ex-amples of the higher plants. Lemna.—One of these is illustrated in fig. 37. This is the common duckweed, Lemna trisidca. It is very peculiar in form and in its mode of growth. Each one of the lateral leaf-like expansions extends outwards by the Fig- 36. elongation of the basal part, which becomes Female plant (gametophvte) , j 1 j >T 1 ^ 1 of a moss (milium), showing long and slender. Next, two new lateral ex- rhizoids below and the tuft of pansion
RF2K6TEHM–Realistic vector illustration of a background with abstract pattern made of aquatic plant Lemna. Green leaves of duckweeds on sunny day
RFJ2C7H3–Western Australia, Broome. Malcolm Douglas Crocodile Park. American alligator (Alligator mississippiensis) in green duckweed covered pond (introduced species, Lemna minuta). (Large format sizes available)
RMPG428W–. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. FEESH-WATEE AQUAEIA.. Fig. 69. Greater Duckweed (Lemna polyrhiza). not at all in Britain. In -winter ttey sink to the bottom of tte water. The Greater Duck- weed (Lemna polyrhiza) (Fig. 69) is rather larger than the rest of the duckweeds. Its fronds or leaves are nearly round, about ^in. in diameter, thiokish, dark green above and pur- ple below, each frond having a number of
RMA8Y1G8–Sail of tourists on a punt (Deux-Sèvres - France). Promenade de touristes sur une plate (Deux-Sèvres - France).
RFJ0DCB0–The ruins of the ancient water tank at the old spreading tree in Deepa Garden, Polonnaruwa, Sri Lanka.
RFW8RDD2–The Irpin River, northwest of Kiev, Ukraine, is covered with green Lemnoideae, also known as Duckweeds or water lenses, during the hot summer.
RMDNPE0W–Portrait of a girl in Congo Mirador village as she rows a boat in waters covered with lemma plants, in Maracaibo lake, Venezuela
RME15NF9–Australia, Western Australia, Broome. Malcolm Douglas Crocodile Park. Saltwater crocodiles (Captive: Crocodylus porosus).
RMMA7HNR–. Elementary botany . Fronds ot the duckweed (Lemna trisulca its mode of growth. Each one of the lateral leaf-like expansions extends out- wards by the elongation of the basal part, which becomes long and slender. Next, two new lateral expansions are formed on these by prolification from near
RMF32E1X–Spraying with chemical weed killer to clear Duckweed which is a rapidly spreading aquatic plant that deprives ponds of oxygen.
RMB4A82Y–geography / travel, BRD, Mecklenburg Western Pomerania, landscape / landscapes, Ruegen Island, Nationalpark Jasmund, alders swamp, Additional-Rights-Clearance-Info-Not-Available
RM2AJEHNX–Elementary botany . HOW PLANTS OB7AIN WATER. 27 frond. A single rootlet grows out from the under side and is destitute. Fig. 3 7-Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootletand through the underside of the frond. 52. Spirodela poly-rhiza.—This is a verycurious plant, closely re-lated to the lemna andsometimes placed in thesame genus. It occursin similar situations, and pjg 3gis very readily grown in Spirodela polyrhiza.aquaria. It reminds one of a little insect asseen in fig. 38. There are several rootlets onthe under s
RF2K6Y6FF–Realistic vector illustration of a background with abstract pattern made of aquatic plant Lemna. Green leaves of duckweeds on sunny day
RFJ2C7H8–Western Australia, Broome. Malcolm Douglas Crocodile Park. Saltwater crocodiles (Crocodylus porosus) in green duckweed covered pond (introduced species, Lemna minuta). (Large format sizes available)
RMPG428P–. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. Fig. 69. Greater Duckweed (Lemna polyrhiza). not at all in Britain. In -winter ttey sink to the bottom of tte water. The Greater Duck- weed (Lemna polyrhiza) (Fig. 69) is rather larger than the rest of the duckweeds. Its fronds or leaves are nearly round, about ^in. in diameter, thiokish, dark green above and pur- ple below, each frond having a number of little roots or fibre
RMDNPDPF–Portrait of a boy in Congo Mirador village as she rows a boat in waters covered with lemma plants,Maracaibo lake, Venezuela
RMF32E1Y–Spraying with chemical weed killer to clear Duckweed which is a rapidly spreading aquatic plant that deprives ponds of oxygen.
RMRDNE9N–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. Fig. 97.—Position of the Chlorophyll-granules in the cells of the Ivy-leaved Duckweed (Lemna trisulca). i In darkness, s in direct sunlight. » In diffuse light. tries under all circumstances to obtain this definite amount. When weakly illuminated, chlorophyll-granules maintain a shape and position in consequence of which they present the largest possible surface to the light; when strongly illumi- nated, they assume a shape and position by which the smallest possible surface is so exposed. These proc
RF2K6Y9R6–Realistic vector illustration of a background with abstract pattern made of aquatic plant Lemna. Green leaves of duckweeds on sunny day
RMF4D09P–Australia, Broome. Malcolm Douglas Crocodile Park. Large saltwater crocodiles (Crocodylus porosus) in front of green duckweed covered pond (Lemna minuta).
RMPG2536–. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. Fig. 292.—Duckweed. Watercress, Nasturtium officinale. Stoneworts, Chara and Nitella (several species of each). Frog-spittle or water-silk, Spirogira. A small quantity of duckweed, Lemna (Fig. 292), placed on the surface of the water adds to the beauty of an aquarium. When it is necessary to add water to an aqua- rium on account of loss by evaporation, rain wa- ter should be used to prevent an undue ac- cumulation of the mineral matter held in s
RMDNPDP6–Portrait of a girl in Congo Mirador village as she rows a boat in waters covered with lemma plants, in Maracaibo lake, Venezuela
RMRDGWF7–. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. Fig. 69. Greater Duckweed (Lemna polyrhiza). not at all in Britain. In -winter ttey sink to the bottom of tte water. The Greater Duck- weed (Lemna polyrhiza) (Fig. 69) is rather larger than the rest of the duckweeds. Its fronds or leaves are nearly round, about ^in. in diameter, thiokish, dark green above and pur- ple below, each frond having a number of little roots or fibre
RF2K6Y9YT–Realistic vector illustration of a background with abstract pattern made of aquatic plant Lemna. Green leaves of duckweeds on sunny day
RMF4D0FA–Australia, Broome. Malcolm Douglas Crocodile Park. Large American alligator (Alligator mississippiensis) covered in green duckweed (introduced species, Lemna minuta).
RMPG253C–. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. THE BREEDING OF INSECTS. 331. Fig. 292.—Duckweed. Watercress, Nasturtium officinale. Stoneworts, Chara and Nitella (several species of each). Frog-spittle or water-silk, Spirogira. A small quantity of duckweed, Lemna (Fig. 292), placed on the surface of the water adds to the beauty of an aquarium. When it is necessary to add water to an aqua- rium on account of loss by evaporation, rain wa- ter should be used to prevent an undue ac- cumulation o
RMDNPE08–A boy with a mental illness stands in his pile-dwelling house surrounded by water covered with lemma plants in Congo Mirador
RMRFT05D–. The care of home aquaria. Aquariums. THE CARE OF HOME AQUARIA 27. â â¢%^-.0^- COMMON BROOK SUCKER. A native fish tliat thrives well. submerged by trimming. The little duckweed (Lemna) which floats entirely at the surface with its tiny roots hanging straight down in the water for a short distance, the moss-fern (Salvi- nia), the thread-like bladderwort (Utricularia) and the floating Riccia are all well adapted to the conditions of the small aquari- um and add greatly to its attractiveness. The plants available for aquarium purposes are entirely too numerous to mention here. There are many nat
RMF4D0BJ–Australia, Broome. Malcolm Douglas Crocodile Park. Large American alligator (Alligator mississippiensis) covered in green duckweed (introduced species, Lemna minuta).
RMDNPDR4–Two girls cross rowing waters covered with lemma plants, in the mouth of the Catatumbo river, Maracaibo´s lake, Zulia
RMRDHGNT–. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. FEESH-WATEE AQUAEIA.. Fig. 69. Greater Duckweed (Lemna polyrhiza). not at all in Britain. In -winter ttey sink to the bottom of tte water. The Greater Duck- weed (Lemna polyrhiza) (Fig. 69) is rather larger than the rest of the duckweeds. Its fronds or leaves are nearly round, about ^in. in diameter, thiokish, dark green above and pur- ple below, each frond having a number of
RMF4D0G6–Australia, Broome. Malcolm Douglas Crocodile Park. Large saltwater crocodiles (Crocodylus porosus) in front of duckweed covered pond (Lemna minuta). (Large format sizes available)
RMDNPDRF–Two boys swim in waters covered with lemma plants, in the mouth of the Catatumbo river, Maracaibo´s lake, Zulia state, Venezuela
RMRGCDJB–. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. Bui. 1098, U. S. Dept of Agriculture. PLATE II.. Fig. 1.—View aloii? channel, Bayou Walnut, natural conditions, showing overhanging vege- tation and aquatic vegetation in bed. Surface of water in foreground covered with duckweed (Lemna spp.) and with aquatic plant, Jussiaeu diffusa, in background.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Uni
RMF4D0GA–Australia, Broome. Malcolm Douglas Crocodile Park. Large saltwater crocodiles (Crocodylus porosus) in front of duckweed covered pond (Lemna minuta). (Large format sizes available)
RMDNPDRY–Two boys swim in waters covered with lemma plants, in the mouth of the Catatumbo river, Maracaibo´s lake, Zulia state, Venezuela
RMRE1KNE–. A manual of botany. Botany. Fiff. 974. A monoecious head of flowers of a species of Duckweed {Lemna mireor;, consisting of two male flowers, each of which is composed of a solitary stamen with a quadrilocular anther ; and one pistillate flower in the centre; the whole surrounded by a spathe. Fig. 975, Vertical section of the pistil of the same. temperate, and tropical regions. Illustrative Genera:—Lemna, Linn.; Pistia, Linn. There are above 20 species. Their pro- perties are imimportant. Series 6.—Apoearpce. Order 30. Tbiubidace^, the Triuris Order.—Diagnosis.— This is a small order of plant
RMF4D0HK–Australia, Broome. Malcolm Douglas Crocodile Park. Large American alligator (Alligator mississippiensis) covered in green duckweed (introduced species, Lemna minuta). (Large format sizes available)
RMRE2A34–. Botany all the year round; a practical text-book for schools. Botany. SUB-AiiRlAL ROOTS 129 rise to the various forms of sub-aerial roots, or those that grow above ground. 183. Water Roots. — Large numbers of plants are adapted to live in the water, either floating freely, as the duckweed {Lemna) and bladderwort {Utriciilaria), or an- chored to mud and sticks on the bottom. Water roots are generally white and threadlike and more tender and suc- culent than ordinary soil roots. Many land plants will develop water roots and thrive on that element if brought into contact with it. Place a cuttin
RMF4D0FP–Australia, Broome. Malcolm Douglas Crocodile Park. Saltwater crocodile (Crocodylus porosus). Saltie, covered in duckweed, with fish in mouth. (Large format sizes available)
RMRGCDHX–. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. Fig. 1.—View aloii? channel, Bayou Walnut, natural conditions, showing overhanging vege- tation and aquatic vegetation in bed. Surface of water in foreground covered with duckweed (Lemna spp.) and with aquatic plant, Jussiaeu diffusa, in background.. Fig. 2.—View across Bayou Walnut, natural conditions, showing absence of overhanging vegetation, with aquatic grass, Zizaniopsis miliacea, in bed. IMPOUNDING WATER TO CONTROL MALARIA MOSQUITOES.. Please note that these images are extracted from scanned page images that may
RMRD9NYA–. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. THE BREEDING OF INSECTS. 331. Fig. 292.—Duckweed. Watercress, Nasturtium officinale. Stoneworts, Chara and Nitella (several species of each). Frog-spittle or water-silk, Spirogira. A small quantity of duckweed, Lemna (Fig. 292), placed on the surface of the water adds to the beauty of an aquarium. When it is necessary to add water to an aqua- rium on account of loss by evaporation, rain wa- ter should be used to prevent an undue ac- cumulation o
RMRD9NY7–. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. Fig. 292.—Duckweed. Watercress, Nasturtium officinale. Stoneworts, Chara and Nitella (several species of each). Frog-spittle or water-silk, Spirogira. A small quantity of duckweed, Lemna (Fig. 292), placed on the surface of the water adds to the beauty of an aquarium. When it is necessary to add water to an aqua- rium on account of loss by evaporation, rain wa- ter should be used to prevent an undue ac- cumulation of the mineral matter held in s
RMRPX8Y0–. The algae. Algae. B 42 THE ALGAE eventually settles on the leaf of a host plant and secretes a wall. Tubular prolongations grow out from these bodies and enter the host, either by way of the stomata or else between two epidermal cells. Subsequently the end of the tube swells out into an eUip- soidal or lobed structure into which the contents of the s warmer pass. In Chlorochytrium lemnae^ which attacks duckweed {Lemna the endoparasitic cells sink down in the old Lemna fronds to the bottom of the pond or stream and remain dormant until the next spring. There is evidence that reduction divisi
![. Elementary botany. Botany. Fig. 3 Fig. 37. Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootlet and through the under side of the "frond." 62. Spirodela poly- rhiza.—This is a very curious plant, closely re- lated to the lemna and sometimes placed in the same genus. It occurs in similar situations, and is very readily grown in Spirudela pulyrhiza. aquaria. It reminds one of a little insect as seen in fig. 38. There are several rootlets on the under side of the frond. Absorption of water takes place here in the sam Stock Photo](https://c8.alamy.com/comp/RE3CG0/elementary-botany-botany-fig-3-fig-37-fronds-of-the-duckweed-lemna-trisculca-of-root-hairs-absorption-of-water-therefore-takes-place-through-this-rootlet-and-through-the-under-side-of-the-quotfrondquot-62-spirodela-poly-rhizathis-is-a-very-curious-plant-closely-re-lated-to-the-lemna-and-sometimes-placed-in-the-same-genus-it-occurs-in-similar-situations-and-is-very-readily-grown-in-spirudela-pulyrhiza-aquaria-it-reminds-one-of-a-little-insect-as-seen-in-fig-38-there-are-several-rootlets-on-the-under-side-of-the-frond-absorption-of-water-takes-place-here-in-the-sam-RE3CG0.jpg ". Elementary botany. Botany. Fig. 3 Fig. 37. Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootlet and through the under side of the "frond." 62. Spirodela poly- rhiza.—This is a very curious plant, closely re- lated to the lemna and sometimes placed in the same genus. It occurs in similar situations, and is very readily grown in Spirudela pulyrhiza. aquaria. It reminds one of a little insect as seen in fig. 38. There are several rootlets on the under side of the frond. Absorption of water takes place here in the sam Stock Photo")
RMRE3CG0–. Elementary botany. Botany. Fig. 3 Fig. 37. Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootlet and through the under side of the "frond." 62. Spirodela poly- rhiza.—This is a very curious plant, closely re- lated to the lemna and sometimes placed in the same genus. It occurs in similar situations, and is very readily grown in Spirudela pulyrhiza. aquaria. It reminds one of a little insect as seen in fig. 38. There are several rootlets on the under side of the frond. Absorption of water takes place here in the sam
![. Elementary botany. Botany. HOW PLANTS OBTAIN WATER. 27 'frond." A single rootlet grows out from the under side anrl is destitute. Fig. 3 Fig. 37. Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootlet and through the under side of the "frond." 62. Spirodela poly- rhiza.—This is a very curious plant, closely re- lated to the lemna and sometimes placed in the same genus. It occurs in similar situations, and is very readily grown in Spirudela pulyrhiza. aquaria. It reminds one of a little insect as seen in fig. 38 Stock Photo](https://c8.alamy.com/comp/RE3CG5/elementary-botany-botany-how-plants-obtain-water-27-frondquot-a-single-rootlet-grows-out-from-the-under-side-anrl-is-destitute-fig-3-fig-37-fronds-of-the-duckweed-lemna-trisculca-of-root-hairs-absorption-of-water-therefore-takes-place-through-this-rootlet-and-through-the-under-side-of-the-quotfrondquot-62-spirodela-poly-rhizathis-is-a-very-curious-plant-closely-re-lated-to-the-lemna-and-sometimes-placed-in-the-same-genus-it-occurs-in-similar-situations-and-is-very-readily-grown-in-spirudela-pulyrhiza-aquaria-it-reminds-one-of-a-little-insect-as-seen-in-fig-38-RE3CG5.jpg ". Elementary botany. Botany. HOW PLANTS OBTAIN WATER. 27 'frond." A single rootlet grows out from the under side anrl is destitute. Fig. 3 Fig. 37. Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootlet and through the under side of the "frond." 62. Spirodela poly- rhiza.—This is a very curious plant, closely re- lated to the lemna and sometimes placed in the same genus. It occurs in similar situations, and is very readily grown in Spirudela pulyrhiza. aquaria. It reminds one of a little insect as seen in fig. 38 Stock Photo")
RMRE3CG5–. Elementary botany. Botany. HOW PLANTS OBTAIN WATER. 27 'frond." A single rootlet grows out from the under side anrl is destitute. Fig. 3 Fig. 37. Fronds of the duckweed (Lemna trisculca). of root hairs. Absorption of water therefore takes place through this rootlet and through the under side of the "frond." 62. Spirodela poly- rhiza.—This is a very curious plant, closely re- lated to the lemna and sometimes placed in the same genus. It occurs in similar situations, and is very readily grown in Spirudela pulyrhiza. aquaria. It reminds one of a little insect as seen in fig. 38
RMREK7X9–. The classification of flowering plants. Plants. 128 FLOWERING PLANTS [CH. The adult plant shews innumerable gradations from a thalloid state, as in the submerged tropical water-herbs forming the order Podostemaceae, or in a less degree in Duckweed (Lemna), to the forest-tree, which in the Australian Blue Gums (Eucalyptus) may reach a height of 400 to 500 feet. A B. Fig. 50. Galium Aparine. A. longitudinal, B. transverse section of seed, x8; e, embryo; pc, pericarp; t, testa; en, endosperm; m, micropyle. C. germination, x 4. D. seedling, x 2. From Lubbock. The vascular bundles of the stem are
Search Results for Duckweed lemna Stock Photos and Images (507)
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