62 TRICHOSTOMUM. 



f t Leaves never diaphanous at their points. 



6. Tr. aciculare ; stems elongated^ branched ; leaves lanceolate^ 



obtuse, serrulated at the points, their nerve vanishing before 

 the summit; capsule oblong; lid rostrate. (TAB. XIX.) 



Tr. aciculare. Palisot de Beauvois Prodr. p. 90. Moug. et Nestl. 

 n. 22. Mohr. Dicranum aciculare. Hedw. St. Cr. v. 3. t. 33. Turn. 

 Muse, Hib. p. 67. EnglBot. t. \97S.-Dill. Muse. t. 46. f. 25 & 26. B. 



HAB. In water, or on very wet rocks and stones. 



This has the leaf singularly obtuse. The colour varies 

 from black, as it occurs in alpine rivulets^ to yellowish - 

 green, as it is found in less wet situations. 



7. Tr. fas declare; stems elongated, branched; leaves lanceo- 



late, entire, their summits never diaphanous ; their margins 

 recurved ; capsule ovato-oblong ; lid rostrate. (TAB. XIX.) 



Tr. fasciculare. Schrader Spicil. p. 51. Hedw. Sp. Muse. Turn: 

 Muse. Hib. p. 39. Engl. Bot. t. 2005. Moug. et NestL n. 215. Bryum 

 lutescens. Dicks. B. hypnoides /3. Linn. Sp. PL p. 1585. Dill. Muse, 

 /.47./.28.&J.46./. 26. C. 



HAB. On rocks in the mountains. 



The acute entire leaves and brighter yellowish-green co- 

 lour of this plant distinguish it easily from the preceding. 

 The want of the diaphanous serrulate points keeps it apart 

 from Tr. canescens and its allies. It is by no means of un- 

 common occurrence; the stems are from one to three inches 

 long. 



8. Tr. polyphyllum ; stems branched ; leaves lanceolate- subu- 



late r their margins recurved, serrated above, very much crisp- 

 ed when dry; capsule oblong; lid rostrate. (TAB. XIX.) 



Tr. polyphyllum. Schwaegr. Suppl. t. 39. Turn. Muse. Hib. p. 35. 

 t. 7- Moug. et Nestl. n. 410. Dicranum polyphyllum. Engl. Bot. j 

 t. 1217- Bryum polyphyllum. Dicks. B. cirratum 0. Huds.-Tr. cir- 1 

 fatum. Smith Fl. Brit. Dill. Muse. t. 48./.41. 



HAB. Rocks and mountains, v 



This species may be easily known from the other Tricho- '. 

 stoma by the greater length and narrowness of the leaves, I 

 and by their remarkably crisped appearance when .in a dry j 

 state. It grows in tufts about an inch in height, arid varies 

 in colour from a light straw-yellow to a dark green. Thej 

 capsules are generally crowded, and the teeth of the peri- j 

 stome connected at the base in filiform pairs. 



9. Tr. ellipticum ; stems short, nearly simple ; leaves lanceo- ( 



late, acuminate, straight, their nerve broad, their margins ' 

 plane; capsule elliptical \ lid rostrate. (TAB. XIX.) 



