. The Bryologist. Bryology; Bryology -- Periodicals. —31— had disappeared, the plants themselves were mostly overturned by the winter's alternate freezings and thawings, and had I not known the exact spot, I would have had great difficulty in finding the moss. The following summer the banks unfortunately fell in, and in consequence our rarity disappeared.—G. N. Best. THE PERISTOHE—I. By a. J. Grout. The peristome, besides being one of the most beautiful of microscopic ob- jects, is also one of the parts most carefully considered in classifying mosses. The details of the differences in developm
. The Bryologist. Bryology; Bryology -- Periodicals. —31— had disappeared, the plants themselves were mostly overturned by the winter's alternate freezings and thawings, and had I not known the exact spot, I would have had great difficulty in finding the moss. The following summer the banks unfortunately fell in, and in consequence our rarity disappeared.—G. N. Best. THE PERISTOHE—I. By a. J. Grout. The peristome, besides being one of the most beautiful of microscopic ob- jects, is also one of the parts most carefully considered in classifying mosses. The details of the differences in development and structure of the various types of peristomes have never been presented in English in a popular form. M. Philibert in the Revue Bryologique has given a masterly presentation of the sub- ject, but it is in French, and too and technical to be of popular inter- est. This series of articles will be based largely on the work of Schimper and Philibert, but will in no sense be a translation of either. Free use will be made of Schimper"s illustrations published in his various works, and these will be sup- plemented by original drawings. The simplest type of peristome is that of Georgia ( Tetraphis), where the tissue which fills the operculum splits into four equal parts, as is shown in the accompanying figure. The oper- culum is composed of a single layer of cells, and is easily deciduous. It is an interesting fact that in An- dreaea and Georgia, which have a thalloid protonema indicating a close relationship to the hepatics, the capsule divides into four parts. In Andreaea the whole capsule dehisces as in the hepatics; in Georgia, only that portion of the tissue lying within the opercu- lum. Prof. D. H. Campbell in his Structure and Development of the Mosses and Ferns, states that he con- siders this resemblance an accident. I am not so sure that this is the case. If he be right, the division of these capsules into four parts, and the division of all moss
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