96 HISTORY OF BRITISH MOSSES. 



sule much resembles that curious Moss, but the peristome 

 is very distinct. 



Generic Character. — Seta terminal. Capsule gibbous. Peri- 

 stome single, forming a plicate, membranous, truncate cone. 



1. DiPHYSCiUM FOLiosuM. {Leafy Bijihr/scmm.) Stem 

 short; cauliue leaves ligulate^ somewhat concave; perichsetial 

 much larger and broadly lanceolate, with a nerve running 

 out into a stout hair, laciniate at the top ; calyptra smooth, 

 mitriform. — Engl. FL p. 13; Mull. Syn.pt. \. p. 812. 



Banks, wall-tops, etc., in alpine situations, often with its 

 growth downwards. Fr. Summer. The curious plicate 

 membrane forming the peristome of this Moss is sufficient 

 to distinguish it from others ; when in fruit it is easily 

 distinguished. It turns to a dingy brown in drying. 



TETHAPHIS, Hedw. (Tetraphis.) 



The four erect teeth at the mouth of the capsule, which 

 give the name to the genus, are easily distinguishable. 

 Tetrodontmtn, the name given by Schwsegrichen, seems more 

 expressive. Miiller, in his Synopsis, has returned to the 

 original name, Georc/ia, of Ehrhart, who, from " a deep 

 feeling of gratitude" to our good King George III., " an 



