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Duckweed lemna Black & White Stock Photos
RFT5YT07–A picture, that's showing Duckweed. It belongs to Araceae family. This is common duckweed, Lemna. Lemna is a genus of free-floating aquatic plants, vi
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
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
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
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
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
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
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
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
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
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
![. 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
![. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Lemna gibba L. Gibbous Duckweed. Fig. 1126. Lemna gibba L. Sp. PI. 970. 1753. Thallus slightly unsymmetrical, obovate or short-obovate, 14"—3" long, thickish or more or less strongly gibbous be- neath, short-stalked when young, soon separating, provided with stomata which are sparse beneath, obscurely 3-5-nerved; rootcap mostly short-pointed, rarely l Stock Photo](https://c8.alamy.com/comp/RDJC3X/an-illustrated-flora-of-the-northern-united-states-canada-and-the-british-possessions-from-newfoundland-to-the-parallel-of-the-southern-boundary-of-virginia-and-from-the-atlantic-ocean-westward-to-the-102d-meridian-botany-botany-lemna-gibba-l-gibbous-duckweed-fig-1126-lemna-gibba-l-sp-pi-970-1753-thallus-slightly-unsymmetrical-obovate-or-short-obovate-14quot3quot-long-thickish-or-more-or-less-strongly-gibbous-be-neath-short-stalked-when-young-soon-separating-provided-with-stomata-which-are-sparse-beneath-obscurely-3-5-nerved-rootcap-mostly-short-pointed-rarely-l-RDJC3X.jpg ". An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Lemna gibba L. Gibbous Duckweed. Fig. 1126. Lemna gibba L. Sp. PI. 970. 1753. Thallus slightly unsymmetrical, obovate or short-obovate, 14"—3" long, thickish or more or less strongly gibbous be- neath, short-stalked when young, soon separating, provided with stomata which are sparse beneath, obscurely 3-5-nerved; rootcap mostly short-pointed, rarely l Stock Photo")
RMRDJC3X–. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Lemna gibba L. Gibbous Duckweed. Fig. 1126. Lemna gibba L. Sp. PI. 970. 1753. Thallus slightly unsymmetrical, obovate or short-obovate, 14"—3" long, thickish or more or less strongly gibbous be- neath, short-stalked when young, soon separating, provided with stomata which are sparse beneath, obscurely 3-5-nerved; rootcap mostly short-pointed, rarely l
RMRDJC56–. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus 2. DUCKWEED FAMILY. 447 2. LEMNA L. Sp. PI. 970. 1753. Thallus disc-shaped, usually provided with a central nerve and with or without two or four lateral nerves. Each thallus produces a single rootlet, which is devoid of vascular tis- sue and is commonly provided with a thin blunt or pointed rootcap. The ovary contains from one to six orthotropous, amphit
![. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 44S . LEMNACEAE. Vol. I. 4. Lemna perpusilla Torr. Minute Duckweed. Fig. 1124. Lemna perpusilla Torr. Fl. N. Y. 2: 245. 1843. L. paucicostata Hegelm. in A. Gray, Man, Ed. 5, 681. 1868. L. perpusilla trinervis Austin, in A. Gray, Man. Ed. 5, 479. 1867. Thallus small, i"-ii" long, oblong to obovate, often purplish- tinged beneath, unsymmetrical and abru Stock Photo](https://c8.alamy.com/comp/RDJC4D/an-illustrated-flora-of-the-northern-united-states-canada-and-the-british-possessions-from-newfoundland-to-the-parallel-of-the-southern-boundary-of-virginia-and-from-the-atlantic-ocean-westward-to-the-102d-meridian-botany-botany-44s-lemnaceae-vol-i-4-lemna-perpusilla-torr-minute-duckweed-fig-1124-lemna-perpusilla-torr-fl-n-y-2-245-1843-l-paucicostata-hegelm-in-a-gray-man-ed-5-681-1868-l-perpusilla-trinervis-austin-in-a-gray-man-ed-5-479-1867-thallus-small-iquot-iiquot-long-oblong-to-obovate-often-purplish-tinged-beneath-unsymmetrical-and-abru-RDJC4D.jpg ". An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 44S . LEMNACEAE. Vol. I. 4. Lemna perpusilla Torr. Minute Duckweed. Fig. 1124. Lemna perpusilla Torr. Fl. N. Y. 2: 245. 1843. L. paucicostata Hegelm. in A. Gray, Man, Ed. 5, 681. 1868. L. perpusilla trinervis Austin, in A. Gray, Man. Ed. 5, 479. 1867. Thallus small, i"-ii" long, oblong to obovate, often purplish- tinged beneath, unsymmetrical and abru Stock Photo")
RMRDJC4D–. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 44S . LEMNACEAE. Vol. I. 4. Lemna perpusilla Torr. Minute Duckweed. Fig. 1124. Lemna perpusilla Torr. Fl. N. Y. 2: 245. 1843. L. paucicostata Hegelm. in A. Gray, Man, Ed. 5, 681. 1868. L. perpusilla trinervis Austin, in A. Gray, Man. Ed. 5, 479. 1867. Thallus small, i"-ii" long, oblong to obovate, often purplish- tinged beneath, unsymmetrical and abru
RMRDWM4K–. Illustrations of the British flora: a series of wood engravings, with dissections, of British plants. Botany; Botany. Lemna gibba, L. Gibbous Duckweed.. 949. Lemna polyrrhiza, L. Greater Duckiveed. '-c^-oo 3:;ca 950. Lemna arrhiza, L. Wolffiaar., Wim., Michelii, Schl. Rootless Ducliweed. LXXVIIL NAIADE/E.. 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.. Fitch, W. H. (Walter Hood), 1817-1892; Smith, George Worthington, 183
Search Results for Duckweed lemna Black & White Stock Photos and Images (18)
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