Its AC0TYLED0N3. — MUSC2. Bryum. 



50. H. commutatum^ stems pinnated, leaves falcato-secund cor- 

 date very much acuminated serrated their margins reflexed. 

 nerve disappearing below the summit, capsule oblongo-ovate 

 curved cernuous, lid conical. Muse. Brit. p. 112. t. 27. 



Hab, Wet rocks. Pentiand hills, &c., Mr. Grevilk. 



B. Leaves destitute of a nerve, or furnished with a very i?:- 

 dislinct one at the base. 



51. H. scorpioides, leaves secund broadly ovate ventricose obtuse 

 entire nerveless, capsules oblongo-ovate curved cernuous, lid 

 conical. Muse. Brit. p. 1 12. t. 27- Lightf. p. 754. 



Hab, Bogs, common. 



52. H. SilesianujH, leaves loosely imbricated secund narrow 

 lanceolate acuminated serrated nerveless or very obscurely 2- 



, nerved, capsule subcylindrical erecto-cernuous, lid conical ob- 

 tuse. Muse. Brit. p. 113. t. 27. 

 Hab. Summit of Ben Luyal, in Sutherland, Hook. 



53. H. cupressiforme, leaves closely imbricated more or less fal- 

 cato-secund lanceolate acuminated entire except at the points 

 which are usually serrated, very faintly 2 -nerved at the base, 

 capsule cylindrical erecto-cernuous, lid conical with a point. 

 Muse. Brit. p. 1 13. t. 27. Lightf. p. 752. 



a. vulgaris, stems broad semicylindrical, leaves falcato-secund, 

 H. cupressiforme, Linn. 



/3. compressum, stems slender compressed, leaves falcato-secund. 

 H. compressum, Linn. Mant. 



y. tenue, stems very slender, leaves very slightly curved narrow- 

 lanceolate quite entire. H. polyanthos, E. B. 



Hab. Banks and trunks of trees, every where. /3. Abundant in 

 woods, y. Mostly on trees. Angus-shire, D. Don. 



54. H. Crista-castrensis, stems closely pectinated, leaves fal- 

 cato-secund ovato-laneeolate acuminated serrulate striated 

 faintly 2-nerved at the base, capsule oblongo-ovate curved 

 cernuous, lid conical. Muse. Brit. p. 114. /. 27. 



Hab. On the ground, rare. Fir-wood, about Forfar, but without fr. : 

 Forest of Bremar, in fr., G. Don. Birch woodS;, of Bunaw, abun- 

 dant, Capt. Carmichael. 



55. H. molluscum, stems pectinated, leaves falcato-secund cor- 

 date much acuminated serrated not striated faintly 2-nerved at 

 the base, capsule oblong- ovate curved cernuous, lid conical. 

 M71SC. Brit. p. 1 14. t. 27. H. Crista-castrensis, Lightf. p. 749. 



Hab. W'oods and rock?, plentiful. 



31. BRYUM. 

 Fruitstalks terminal. Peristome doubley the exterior of 16 

 teeth ; the interior of a membrane cut into 16 equal segments, 

 with filiform processes frequently placed between them. Ca- 

 lypira dimidiate. Muse, Brit. p. 1 15. t. 3. 



