78 APLOPERISTOMI. I Weissia. 



Bryum nudum. Dicks. Crypt Fasc. 4. t. 10. f. 15* 



Weissia rosea. Wahl. Fl Lapp. t. 19. 



Weissia incarnata. Schwaegr. Suppl. v. 1. p. 66. t. 18. 



HAB. On clayey soil in the north of England, and Scot- 

 land. 



If there were not abundant other marks of discrimination to 

 separate this from the rest of the British species of Weissia, the 

 greater size of its annulus, and the nature of its teeth, which 

 are broad, and split from their centre to their base, might be 

 adduced as peculiarities of this singular plant. It is the only 

 one, too, of its genus, which has the leaves destitute of a nerve ; 

 these, as maturity advances, become of a reddish colour, whence 

 Wahlenberg's expressive name of rosea, and Schwaegrichen's 

 scarcely less so of incarnata. We have, however, been obliged 

 to retain the appellation given to it by its first describer, our 

 late countryman and acute cryptogamist, Mr. Dickson. This 

 moss still exists in the spot originally pointed out by Mr. Caley, 

 near Manchester, whence we have received specimens from Mr. 

 Hobson. The late Mr. Don found it by the sides of the Tay, 

 near Perth. 



f f Leaves furnished with a nerve. 

 +- Leaves ovate or lanceolate. 



4. W. nigrita; stems elongated, leaves lanceolate acuminated, 

 capsule obovate cernuous gibbous sulcate, lid hemispherical 

 obtusely pointed. (TAB. XIV.) 



Weissia nigrita. Hedw. St. Cr. v. 3. t. 39. Schwaegr. Suppl 

 v. 1. p. 74. Hook. Fl. Scot. P. II. p. 130. Brid. Meth. p. 47. Hob- 

 son, Brit. Mosses, v. 2. n. 28. Drummond, Muse. Scot. v. 1. n. 27. 

 Funck, Deutschl. Moose, t. 10. / 13. Arn. Disp. Muse. p. 26. 

 Grimmia nigrita. Smith, Fl. Brit. p. 1195. Engl Bot. t. 1825. 

 Bryum nigritum. Dicks. 

 HAB. Moist banks in mountainous districts, plentiful on 



Ben-y-gloe, near Blair in Athol. 



This plant has a capsule still more remarkable for its inclina- 

 tion than the preceding, and is truly arcuato-cernuous. In all 

 the remaining British Weissia the capsule is either erect or 

 very nearly so. 



