TfttCHOSTOiMUM. 



61 



Tr. canescens ; stems elongated, irregularly branched ; leaves 

 ovato-lanceolate, their diaphanous acuminated points slightly 

 serrated ; capsule ovate ; teeth of the peristome very long 

 and filiform; lid subulate. (TAB. XIX.) 



Tr. canescens. Hedw. St. Cr. v. 3. t. 5. Turn. Muse. Hib. p. 39. 

 Engl Bot. t. 2534. Moug. et Nestl n. 20. Tr. ericoides. Schrad. 

 Turn. Muse. Hib. p. 38. Engl Bot. t. 1991. Schwaegr. Suppl. f. 38. 

 Moug. et Nestl. n. 409. Dill. Muse. t. 47. f. 27. B. &/.31. 



HAB. On heaths and in mountainous countries ; also on 

 the sea-beach near Yarmouth. 



The Tr. ericoides of authors has somewhat of a pinnated 

 appearance, arising from numerous very short branches ; but 

 in the form of the leaves, capsule, and peristome it perfectly 

 accords with Tr. canescens. 



Tr. heterostichum ; stems elongated, branched ; leaves ovato- 

 lanceolate, their diaphanous acuminated points slightly ser- 

 rated; capsule oblong, teeth of the peristome rather short; 

 lid rostrate. (TAB. XIX.) 



Tr. heterostichum. Hedw. St. Cr. . 2. t. 25. Turn. Muse. Hib. 

 p. 37. Engl Bot. t. 1347. Moug. et Nestl n. 19. Bryum heterosti- 

 chum. Dicks. Dill Muse. t. 4J. f. 27. A. & F. & G, 



HAB. On stones in mountainous districts. 



It is by no means an easy task to distinguish between this 

 and the preceding species, without an examination of the 

 peristome, where the principal and most important diffe- 

 rence certainly lies. The teeth of the fringe in this moss 

 are much shorter, and split after the manner of a Dicra- 

 num, but nearly to the base ; while those of Tr. canescens 

 are very long and filiform . The capsule too presents a slight 

 difference, being ovate in Tr. canescens, and oblong or cy- 

 lindraceous in Tr. heterostichum. 



Tr.microcarpon; stems elongated, branched ; leaves lanceo- 

 late, their diaphanous acuminated points slightly serrated ; 

 capsule oblong ; teeth of the peristome rather short ; lid 

 rostrate. (TAB. XIX.) 



Tr. microcarpon. Hedw. Sp. Muse. t. 23. f. 8-12. Turn. Muse. Hib. 

 p. 40. Engl Bot. t. 1440. Moug. et Nestl n. 315. Dicranum acicu- 

 lare var. <y. Turn. Muse. Hlb. p. 67. Dill Muse. t. 47. f. 29. 

 HAB. On rocks. 



We have noticed in some specimens the diaphanous ap- 

 pearance at the tops of the leaves quite to vanish, which has 

 induced us to include in our synonyms Mr. Turner's acute - 

 leaved variety of his Dicranum ac iculare ; in other parti- 

 culars the two plants do not at all differ. 



