Bryum.-] D I PL O PER I ST O M I. 205 



same rigid and glossy texture, and in this respect they are allied 

 to JS. nutans. The peristome is that of a Pohlia. 



18. B. alpinum ; stems elongated rigid branched, leaves closely 

 imbricated erect lanceolate somewhat obtuse subserrulate at 

 the apex margins revolute nerve reaching to the points, cap- 

 sule oblongo-ovate pendulous. (TAB. XXVIII.) 



Bryum alpinum. Linn. Mant. v. 2. p. 309. Turn. Muse. Hib. p. 

 125. Smith, Fl. Brit. p. 1358. Engl. Bot. t. 1263. Moug. et 

 Nestl. n. 221. Schwaegr. Suppl. t. 73. Funck, Deutschl. Moose, t. 29. 

 / 11. Hook. Fl. Scot. P. II. p. 151. Hobson, Brit. Mosses, v. 2. n. 

 79. Am. Disp. Muse. p. W.Ditt. Muse. t. 50. f. 64. 



HAB. On rocks in subalpine countries, common. 

 This species is best known by its deep shining purple colour, 

 its rigid stems and leaves, which latter are straight, as well 

 when dry as when moist. It is, nevertheless, difficult to form a 

 specific character that will separate it from some of the varieties 

 of JS. ventricosum. We do not observe the leaves to be " octo- 

 fariam imbricata," as Schwaegrichen describes them. 



1 9. jB. ventricosum ; stems elongated branched with innovations, 



leaves oblong acuminated scarcely serrulate margins recurved 

 nerve reaching beyond the point, capsule oblongo-ovate pen- 

 dulous. (TAB. XXX.) 



Bryum ventricosum. Dicks. PL Crypt. Fasc. 1. p. 4. Turn. Muse. 

 1Kb. p. 126. Smithy Fl. Brit. p. 1365. Engl. Bot. t. 2270. Hook. 

 Fl. Scot. P. II. p. 151. Hobson, Brit. Mosses, v. 1. n. 103. Am. 

 Disp. Muse. p. 46. 



Bryum bimum. Schreb. Fl. Lips. p. 83. Turn. Muse. Hib. p. 127. 

 Smith, FL Brit. p. 1365. EngL Bot. t. 1518. Moug. et Nestl. n. 223. 

 Funck, Deutschl. Moose, t. 31. / 22. Brid. Meth. p. 118. 



Bryum cubitale. Dicks. PL Crypt. Fasc. 2. t. 5. Smith, Fl. Brit, 

 p. 1364. Engl. Bot. t. 2554. Brid. Meth. p. 108. 



Mnium pseudo-triquetrum. Hedw. St. Cr. v. 3. t. 7. 



Bryum pseudo-triquetrum. Brid. Meth. p. 118. Funck, Deutschl. 

 Moose, t. 31. f. 21 Dill. Muse. t. 51. f. 72. 



HAB. Marshy ground, and in wet places in the crevices of 



rocks. 



We have carefully examined authentic specimens of all the 

 synonyms above quoted, and have no hesitation in reducing 

 them to one species. The stems are from two to four inches 



or more in length, including the innovations, which are very 



10 



