Orthotrichum.-\ DIPLOPERISTOMI. 125 



pearance, arising entirely from within the range of the teeth; 

 but, we believe, in all the remaining species the ciliary processes 

 arise from the same membrane, and exactly from the sides of 

 the teeth, as we have represented at /. 2. of the figure of 

 the peristome in TAB. II. Notwithstanding these anomalies of 

 the peristome, no genus of mosses is more natural in habit ; and 

 we cannot accord with Mohr, that the difference of the splitting of 

 the base of the calyptra, in one instance in the furrow, in another 

 in the elevation or keel, is by any means of sufficient importance 

 to warrant the detaching of O. crispum from the rest of the 

 species. 



* Peristome simple. 



f Capsule immersed. 



1. O. cupulatum; leaves ovato-lanceolate erecto-patent, when 

 dry erect straight rigid, capsule nearly sessile furrowed for 

 its whole length, calyptra somewhat hairy afterwards quite 

 glabrous. (TAB. XXI.) 



Orthotrichum cupulatum. Hoffm. Germ. v. 2. p. 26. Scliwaegr. 

 Suppl. v. 1. P. II. p. 35. t. 55. Moug. et Nestl n. 723. Brid. Meth. 

 p. 109. Hook. Fl. Scot. P. //. p. 137. Funck, Deutschl Moose, t. 

 23. n. 13. Drummond, Muse. Scot. v. 2. n. 51. Hook, and Grev. 

 in Edin. Journ. of Science, v. I. p. 112. Arn. Disp. Muse. p. 16. 



Orthotrichum anomalum. Smith, Fl. Brit. p. 1267. Engl. Bot. t. 

 1423. 



Orthotrichum nudum. Smith, Fl. Brit. p. 1268. Engl. Bot. t. 

 1325. Dicks. Crypt. Fasc. 4. t. 10. / 13. Turn. Muse. Hib. p. 97. 

 Brid. Meth. p. 111. 



Orthotrichum strangulatum. Beauv. JEtheog. p. 51. Schwaegr. 

 Suppl v. 2. p. 33. t. 54. 



HAB. Rocks and trunks of trees. 



Plant of a rigid habit, dark colour, and scarcely exceeding an 

 inch in height ; the leaves remarkably straight, obtuse, with a 

 strong and reddish nerve. Capsule deeply furrowed, and 

 calyptra scarcely at all hairy. 



By an examination of authentic specimens of O. strangula- 

 tum, we are satisfied that it is nothing more than O. cupulatum ; 

 and Schwaegrichen's figure of it, above quoted, differs only in 

 its showing a slight contraction near the middle of the capsule, 

 which is probably owing to the seeds having already escaped. 



