. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. Fig. 240. 342. We shall now consider the mode of reproduction in the Mosses. Let us commence with the spore. This, upon meeting with proper conditions, bursts its outer coat (the exospore), and the inner coat (the endospore) is then pro- truded as a slender tube. This continues to grow by repeated divi- sion, until at length, in most cases, a tangled thread-like mass of vege- tation is produced,
. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. Fig. 240. 342. We shall now consider the mode of reproduction in the Mosses. Let us commence with the spore. This, upon meeting with proper conditions, bursts its outer coat (the exospore), and the inner coat (the endospore) is then pro- truded as a slender tube. This continues to grow by repeated divi- sion, until at length, in most cases, a tangled thread-like mass of vege- tation is produced, to which the name ^;n;^owema has been given. After the lapse of several days minute buds are developed at differ- iint points upon the protonema, and these are found to consist of whorls of scaly leaves. This is the beginning of the development of the ordinary Moss-plant. Upon the plants thus arising from the buds are developed antheridia and archegonia, the former in the axils of tij3 leaves forming the rosettes shown in Fig. 240, and the latter at the apex of other stems, as shown in Fi«. 239. The antheridia ire seen under the microscope bo be club-shaped bodies, containing a mass of cells in which the antherozoids are formed. The archegonia are flask-shaped bodies, with a lower expanded portion and a long neck above. Fig. 242 shows the apex of a fertile Fit?. 240.—Apex of sterile stem, showinj? rosette of perlgonial leaves, in the ixils of which are tlio antluiridia ; greatly enlarged. Fig. 241.—Knlargod view of capsule, showing peristorao and detached oper- 111. (Wood and Steele.). Fig. 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 Spotton, H. B. (Henry Byron), 1844-1933. Toronto : W. J. Gage
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, booksubjectpl
