Grimmia.'} APLOPERISTOMI. 65 



or perforated, rarely cleft, equidistant teeth; Calyptra 

 mitriform. (TAB. II.) 



This is a genus so closely bordering upon Trichostomum, that 

 it is not possible to form either a natural or artificial character 

 that may decidedly distinguish them. We have rather retained 

 it in deference to the opinion of preceding Botanists, than from a 

 thorough conviction of the propriety of so doing. The species all 

 grow in a densely tufted manner, and are of a blackish or brownish 

 hue, mostly with rather short stems. Grimmia concolor, however, 

 which has decidedly the teeth peculiar to the genus, bears stems as 

 long as those of many Trichostoma. Grimmia ovata, and Grim- 

 mia pulvinata, have sometimes their teeth cleft ; the latter indeed 

 generally. 



* Fruit sessile, or nearly so. 



1. Gr. apocarpa ; stems branched, leaves ovato-lanceolate recur- 

 vo-patent, their margins reflexed, the perichsetial ones hav- 

 ing their nerve disappearing immediately below their sum- 

 mits, capsule ovate sessile, lid shortly rostrate. (TAB. XIII.) 

 . nigro-viridis , leaves broader, blackish green. 



Grimmia apocarpa. Hedw. St. Cr. v. 1. t. 39. Turn. Muse. Hib. 

 p. 20. Smith, Fl. Brit. p. 1200. Engl. Hot. t. 1134?. Moug. et Nestl. 

 n. 17. Schwaegr. Suppl. v. 1. p. 96. Brid. Meth. p. 33. Drummond, 

 Muse. Scot. v. \.p. 26. Hook. Fl. Scot. P. II. p. 128. Arn. Disp. 

 Muse. p. 20. Funck, Deutschl. Moose, t. 12. n. 20. 



Gr. alpicola. Swartz, Muse. Suec. t. 1. Hedw. Sp. Muse. t. 15. 

 Smith, Fl. Brit. p. 1199. Schwaegr. Suppl. v. 1. p. 95. Brid. Meth. 

 p. 33. 



Gr. rivularis. Brid. in Schrad. Journ. v. 5. t. 3. Turn. Muse. Hib. 

 p. 21. t. 2.f. 2. Schwaegr. Suppl v. I. t. 23. Funck, Deutschl. Moose, 

 t. 12. f. 22. Smith, Fl. Brit. p. 1200. Moug. et Nestl n. 508. 



Gr. fasciculata. Brid. Meth. p. 37. 



Gr. gracilis. Schwaegr. Suppl v. 1. t. 23. Brid. Meth. p. 33. Moug. 

 et Nestl n. 509. 



Gr. conferta. Funck, Deutschl Moose, t. 12. f. 19. 



Gr. apocaula. Hoffm. Moug. et Nestl n. 18 Dill. Muse. t. 32. 



/3. stricta , stem elongated, leaves narrower, reddish brown. 



Grimmia stricta. Turn. Muse. Hib. p. 20. t. 2.f. 1. Brid. Meth. p, 

 34. 



Hedwigia nervosa. P. de Beauv. 

 E 



