Trichostomum.] MUSCI. 19 



pitose ; leaves nearly distichous, subulate-setaceous ; capsule 

 erect, ovato-cylindraceous ; lid conical. Schrad. Spic. p. 64. 

 Muse. Brit. ed. 2, p. 119, t. 20. 



On Ben Bulben, near Sligo. The largest native species of the 

 genus when growing in moist and shaded situations. 



10. D. heteromallus, HOOK, et TAYLOR. Stems short; leaves 

 subsecund, subulate ; capsule ovato-cylindraceous ; lid conical, 

 obtuse. Muse. Brit. ed. 1, p. 68 ; ed. 2, p. 119, t. 20. 



Wet banks, very common. 



11. D. pusillus, HEDW. Leaves erect, rigid, from a broad, 

 lanceolate base, subulate ; capsule erect, oblong ; lid obliquely 

 rostrate. Hedw. Sp. Muse. p. 104. Eng. Bot. t. 2380. Hook. 

 Eng.FLv. 5, part l,p. 31. 



Near Belfast. Mr. Templeton : afterwards Mr. Drummond. 



12. D. cylindricus. HOOKER. Stem short, simple ; leaves 

 from a sheathing base subulato-setaceous, entire, spreading on 

 all sides, recurvo-patent, flexuose ; capsule cylindraceous, in- 

 clined ; lid conical; somewhat obtuse. Hook. Eng. Fl. v. 5, part 

 I, p. 32. Trichost. cylindricum, Hedw. Sp. Muse. t. 24, f. 713. 



Ditch Bank, near Orange Grove, Belfast, Mr. Drummond. I have 

 not yet seen native specimens ; the above is on the authority of Dr. 

 Hooker. 



15. TRICHOSTOMUM. Hedw. 



Seta terminal. Peristome single, of 16 teeth divided to the base 

 or 32, approached in pairs. Calyptra campanulate. 



1. T. lanuginosum, HEDW. Stems elongated, subpinnated ; 

 leaves lanceolato-subulate, acuminate, their long diaphanous 

 points serrated, their margins recurved ; capsule ovate ; setce 

 short, on lateral branches; lid rostrate. Hedw, St. Cr. v. 3, t. 2, 

 Muse, Brit. ed. 2, p. 105, t. 19. 



On mountains ; common. 



2. T. canascens, HEDW. Stems elongated; leaves ovato-lan- 

 ceolate, acuminated, their diaphanous points slightly serrated ; 

 capsule ovate ; teeth of the peristome very long and filiform ; 

 lid subulate. Hedw. St. Cr. v. 3, t. 5. Muse. Brit. ed. 2, p. 106, 

 *. 19. 



On mountains and heaths ; common. 



3. T. heterostichum, HEDW. Stems elongated ; leaves ovato- 

 lanceolate, acuminated, their diaphanous points slightly ser- 

 rated ; capsule obovato-cylindraceous ; teeth of the peristome 

 rather short; lid rostrate. Hedw. St. Cr. 2, t. 25. Muse. Brit. 

 ed. 2, p. 106, 1. 19. 



On stones on the mountains ; common. The teeth of the peristome 

 are connected at the base, very short and by no means erect. The 

 capsule swells above, yet has a contracted mouth. 



