Trichostomum.] APLOPERISTOMI. 107 



Trichostomum heterostichum. Hedw. St. Cr. v. 2. t. 25. Turn. 

 Muse. Hib. p. 37. Smith, Fl. Brit. p. 1239. Engl Bot. t. 1347. 

 Schwaegr. Suppl v. 1. p. 149. Moug. et Nestl. n. 119. Hook. Fl 

 Scot. P. II. p. 134. Hobson, Brit. Mosses, v. 2. n. 39. Funck, 

 Deutschl. Moose, t. 17. n. 11. Am. Disp. Muse. p. 22. 

 Racomitrion heterostichum. Brid. Meih. p. 79. 

 Racomitrion alopecurum. Brid. Meih. p. 79. 



Bryum heterostichum. Dicks Dill. Muse. t. 47. / 27. A. and F. 



and 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 peri- 

 stome, where the principal and most important difference cer- 

 tainly lies. The teeth of the fringe in this moss are much 

 shorter, and split after the manner of a Dicranum, but nearly to 

 the base ; while those of T. canescens are very long and filiform. 

 The capsule, too, presents a slight difference, being ovate in 

 T. canescens, and oblong or cylindraceous in T. heterostichum. 

 5. T. microcarpon; stems elongated branched, leaves lanceolate 

 their diaphanous acuminated points slightly serrated, capsule 

 ovate, teeth of the peristome rather short, lid rostrate. 

 (TAB. XIX.) 



Trichostomum microcarpon. Hedw. Sp. Muse. t. 23. / 8 12. 

 Turn. Muse. Hib. p. 40. Smith, Fl. Brit. p. 1243. Engl Bot. t. 1440. 

 Schwaegr. Suppl v. 1. p. 150. Moug. et Nestl. n. 315. Hook. FL 

 Scot. P. II. p. 154. Hobson, Brit. Mosses, v. 2. n. 40. Drummond, 

 Muse. Scot. v. 2. n. 45. Funck, Deutschl. Moose, t. 18. n. 14. Arn. 

 Disp. Muse. p. 22. 



Racomitrion microcarpum. Brid. Meth. p. 79. 

 Dicranum aciculare. y. yracile. Turn. Muse. Hib. p. 67. 

 Trichostomum sudeticum. Funck, Deutschl Moose, t. 18. n. 15. 

 Dill Muse. t. 47. / 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 aciculare ; in other particulars 

 the two plants do not at all differ. 



f f Leaves never diaphanous at the points. 

 6. T. aciculare; stems elongated branched, leaves lanceolate 



