. The evolution of plant life, lower forms. Cryptogams; Plants. STARCH. 39 absorption of carbonic dioxide, the evolution of oxygen, and the formation of starch, which first manifests itself in the form of minute solid particles—starch grains—^within the chlorophyll corpuscles. The formation of starch grains is a rapid process under favourable conditions, especially in the lower plants, appearing after five minutes' exposure to bright sunlight in Spirogyra, a minute fresh-water alga, and after about two hours in the Screw moss, Funaria Fig. 8.—(X 540). Starch grains from a potato
. The evolution of plant life, lower forms. Cryptogams; Plants. STARCH. 39 absorption of carbonic dioxide, the evolution of oxygen, and the formation of starch, which first manifests itself in the form of minute solid particles—starch grains—^within the chlorophyll corpuscles. The formation of starch grains is a rapid process under favourable conditions, especially in the lower plants, appearing after five minutes' exposure to bright sunlight in Spirogyra, a minute fresh-water alga, and after about two hours in the Screw moss, Funaria Fig. 8.—(X 540). Starch grains from a potato tuber, A, a simple grain show- ing the lines of stratification and the nucleus or hilum at c. C and D, compound grains, formed by the development of new hila in an ordinary grain, each hilum being surrounded by its own layers. (From Strasburger.) Starch is very widely distributed in all plants except fungi, in which group it is entirely absent. It appears under the form of minute colourless grains, varying in shape, but constant in each species; usually oval, sometimes spherical or lenticular, and marked with concentric or eccentric lines. 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 Massee, George, 1850-1917. London, Methuen & Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1891
