Dicranum.'} APLOPERISTOMI. 95 



so often in completely intermediate states. The more common 

 appearance of this moss, and indeed the only one met with on 

 plains, has very short stems and pale yellow leaves, which are 

 so fragile as generally to be met with broken off, and lying 

 upon the tufts in considerable quantities, looking at first not 

 unlike the dimidiate calyptrse of this genus ; and hence the Br. 

 fragile of Dickson. The alpine varieties, and those found on 

 wet rocks, have stems sometimes a span in length ; are generally 

 of a blackish colour, with leaves diaphanous at their points, 

 and rarely producing fructification. The calyptra of this and 

 of its foreign affinities is fringed at the base with long cilise, as 

 represented in Muse. Hib. in the cryptogamic part of Hum- 

 boldt's Botany of South America, and in our figure, TAB. XVI, 

 although this singularity in its structure has been generally 

 overlooked by botanists. 



f f Nerve narrow. 

 -t- Capsule with a struma. 



9. D. virens ; stems elongated, leaves from a broad sheatliing base 



subulate, their margins recurved crisped when dry pointing 

 in all directions, capsule smooth oblongo-cylindrical subcernu- 

 ous strumose, lid rostrate. (TAB. XVII.) 



Dicranum virens. Hedw. St. Cr. v. 3. t. 32. Turn. Muse. Hib. p. 

 69. Smith, Fl. Brit. Engl. Bot. t. 1462. Hook. Fl. Scot. P. II. p. 

 132. Schwaegr. Suppl v. 1. p. 194. Funck, DeutscM. Moose, t. 22. 

 n. 33. Drummond, Muse. Scot. v. 2. n. 41. Am. Disp. Muse. p. 

 29. Brid. Meth. p. 54. 



HAB. In marshy places, upon mountains. Abundant upon 



Ben Lawers. 



This is always an alpine plant. British specimens differ 

 from continental ones by having longer points to the leaves, 

 which are entire. 



10. D. Schreberianum ; stems rather short simple tufted, leaves 



squarrose from a very broad sheathing base suddenly subu- 

 late crisped when dry, capsule ovate subcernuous, struma 

 distinct, lid rostrate curved. ( SUPPL. TAB. III.) 



Dicranum Schreberianum. Hedw. Sp. Muse. p. 144. t. 33. 

 Schwaegr. SuppL v. 1. p. 179. Funck, Deutschl Moose, t. 21. n. 21. 



