188 DIPLOPERISTOMI. [Hypnum. 



The transverse undulations are peculiarly striking even to the 

 naked eye, in which particular, as well as in the broader and 

 shorter, more plane, secund, but not falcate leaves, it differs 

 from all the varieties of H. aduncum. Its fructification, we be- 

 lieve, has never been found in any country. 



62. H. commutatum ; stems pinnated, leaves falcato -secund cor- 



date very much acuminated serrated their margins reflexed 



nerve disappearing below the summit, capsule oblong curved 



and cernuous, lid conical. (TAB. XXVII.) 



Hypnum commutatum. Hedw. St. Cr. v. 4. t. 26. Turn. Muse. 



Hib. p. 196. Smith, Fl. Brit. p. 1333. Engl. Sot. t. 1569. Moug. 



et Nestl n. 523. Funck, Deutschl Moose, t. 5. /. 79. JBrid. Meth. 



p. 177. Hook. Fl. Scot. P. II. p. 148. Hobson, Brit. Mosses, v. 1. 



n. 94. Drummond, Muse. Scot. v. 2. n. 84. Am. Disp. Muse. p. 67. 



Dill. Muse. t. 36. / 19. 



Hypnum filicinum. var. Schwaegr. Suppl. v. 1. P. II. p. 297. 

 HAB. Wet places, particularly in a calcareous soil. 



Besides the characters that we have pointed out under H. 

 jftlicinum to distinguish that and the present species, we may 

 add, that this is much the largest, far less rigid in the stems 

 and leaves, and of a paler and greener colour. The leaves are 

 likewise, (for want of the excurrent nerve,) disposed to be 

 curved, and to become twisted when dry. 



B. Leaves destitute of a nerve, or furnished ivith two very indistinct 

 ones at the base. 



63. H. scorpioides ; leaves secund broadly ovate ventricose ob- 

 tuse entire nerveless, capsules oblongo-ovate curved cernuous, 

 lid conical. (TAB. XXVII.) 



Hypnum scorpioides. Linn. Sp. PL p. 1592. Hedw. Sp. Muse. p. 

 295. Schwaegr. Suppl. v. I. P. II. p. 293. t. 95. Turn. Muse. Hib. 

 p. 187. Smith, Fl. Brit. p. 1326. Engl Bot. t. 1039. Moug. et 

 Nestl. n. 522. Funck, Deutschl. Moose, t. 51. / 74. Hook. Fl. Scot. 

 P. II. p. 148. Hobson, Brit. Mosses, v. 2. n. 72. Drummond, Muse. 

 Scot. v. 2. n. 85. Arn. Disp. Muse. p. 68. Brid. Meth. p. 181. 

 HAB. Bogs, common ; on the Sands of Barrie near For- 



far. Mr. Drummond. 



This, which is one of the largest of the British Mosses, is at 

 once distinguished from its affinities by its obtuse and nerveless 



