. The elements of structural botany with special reference to the study of Canadian plants ... Plant physiology; Plant anatomy. 102 ELEMENTS OP STRUCTURAL BOTANY. 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 protonema has been given. Afte
. The elements of structural botany with special reference to the study of Canadian plants ... Plant physiology; Plant anatomy. 102 ELEMENTS OP STRUCTURAL BOTANY. 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 protonema has been given. After the lapse of several days Fig. 240. minute buds are developed at differ- ent 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 the leaves forming the rosettes shown in Fig. 240, and the latter, at the apex of other ^ems, as shown in Fig. 239. The antheridia ^ are seen under the microscope ^^- ^^'^• bo be club-shaped bodies, containing a mass of cells in which the antherozoids are formed. The archegonia are [lask-shaped bodies, with a lower expanded portion and a long neck above. Fig. 242 shows the apex of a fertile Fig. 240.—Apex of sterile stem, sliowing rosette of perigonial leaves, in thq jixils of which are the antheridia; greatly enlarged. Fig. 241.—Enlarged view of capsule, showing peristome and detached oper-. sulum. (Wood and Steele.). 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, Henry Byron, 1844-. Toronto, W. J. Gage & Co
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