. 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; Botanique; Botanique. Jill EXAMINATION OP A MOSS. 191 â upon, is are roots. rshy 341. The ^lender scape-like stalk which rises above the leaves is technically called the seta, or bristle ; in the left-hand part of the figure («) the upper end of the seta is covered by a hairy cap, the calyptra. In the right-hand por- tion the calyptra has been re- moved, disclosing a little pod, variously spoken of as the tlieca,
. 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; Botanique; Botanique. Jill EXAMINATION OP A MOSS. 191 â upon, is are roots. rshy 341. The ^lender scape-like stalk which rises above the leaves is technically called the seta, or bristle ; in the left-hand part of the figure («) the upper end of the seta is covered by a hairy cap, the calyptra. In the right-hand por- tion the calyptra has been re- moved, disclosing a little pod, variously spoken of as the tlieca, or urn^ or capsule, or s])oran<jiwn. Fig. 241 is an enlarged view. This capsule is closed at the top by a circular lid, the operculum, which falls away when the cap- sule is mature, thus allowing the escape of the sj^ores, which are produced in it. The spores are developed upon the surface of a central column which rises from the bottom of the capsule, and which is known as the columella. The opening through which the spores escape is called the stoma, and a good lens reveals the fact that around the stoma there is a circle (sometimes two) of minute teeth, known collectively as the peristome. In tlie Moss now be- fore us the peristome consists of sixty-four teeth. In other Mosses the number varies, })eing always, however, some power of 2 ; either 4, or 8, or 16, or 32, or 64. Occasionally the teeth are altogether absent. Fip. 230.âTwo fertile stems of a Moss (Pohftricliaiii commune) of the natural size; at c the calyptra is seen enveloping the capsule. (Wood and Steele).. Fig. 239. y|-. 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: ., book, bookcentury1800, booksubjectbotany, booksubjectplantanatomy
