. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 206 DIATOMS of variously shaped gelatinous clumps (Fig. 112, B) in which are embedded numerous tortuous chains of rounded cells, inter- rupted here and there by slightly larger colourless ones [lieterocysts, seen also in Tolypothrix, Fig. 112, E, h.) of uncertain function. The Cyanophyceas often play a very important part in nature as the first plants to colonise bare ground. In every habitat where other Algfe occur there can usually be found unicellular, or more rarely colonial, forms known as Diatoms (Fig.
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 206 DIATOMS of variously shaped gelatinous clumps (Fig. 112, B) in which are embedded numerous tortuous chains of rounded cells, inter- rupted here and there by slightly larger colourless ones [lieterocysts, seen also in Tolypothrix, Fig. 112, E, h.) of uncertain function. The Cyanophyceas often play a very important part in nature as the first plants to colonise bare ground. In every habitat where other Algfe occur there can usually be found unicellular, or more rarely colonial, forms known as Diatoms (Fig. 113) which possess quite special characteristics of. Fig. 112.—Diverse Blue-green Algx-. A, Chroococcus. B, Single thread from colony of Nostoc (shown natural size in b). C, Glceocapsa. D, Anabrsna (withs-pore, Sp.). E, Tolypothrix. F,Lyngbya. G, Rivti- laria. h., heterocysts ; sh , sheath. their own, and whose exact relationship to the other groups is not clear. The individuals are either unattached, and in that case often endowed with a power of fairly rapid movement, or else fixed to the surface of larger Alga:: and other aquatics. The Diatoms are brown or greenish in colour, though a few species are colour- less and saprophytic, and each plant is provided with a cell-wall richly impregnated with silica, and usually bearing a symmetrical and often highly elaborate pattern of sculptured markings (Fig. 113). With the death of the organisms the practically unaltered siliceous shells sink, so that, where Diatoms are plentiful, deposits. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
