26 MUSCI-ACROCARPI-PERISTOMI. [Grimmia. 



6. G. spiralis, Hook, and Taylor, (spiral-leaved Grimmia); 

 stems elongated pulvinate, leaves lanceolate tapering into a dia- 

 phanous hair-like point erect when moist, spirally twisted 

 when dry, seta curved, capsule ovate smooth. Drum. Muse. 

 Scot. v. 2. n. 29. Grev. Fl. Cr. Scot. t. 203. Muse. Brit. ed. 2. 

 p. 69. Suppl. t. 2, — G. cernua, Bryol. Germ. v. 2. p. 174. t. 24. 

 /. 23. 



Abundant on rocks, and especially dry and exposed ones, in the 

 higher mountains, both of Scotland and Ireland. Fr. Sept. — We 

 observe a dark central line in the teeth of this moss, and Dr. Greville 

 finds some to be bifid or even trifid at the extremity. 



7. G. torta, Hornsch. and Nees, (tivisted-leaved Grimmia); 

 stems elongated exceedingly densely pulvinate of a very soft 

 texture, leaves lanceolate acuminate the upper ones scarcely 

 piliferous, all of them remarkably spirally twisted when dry. 

 Bryol. Germ. v. 2. p. 179. t. 22. f. 24. — G. torquata, Hook, in 

 Drum. Muse. Scot. v. 2. n. 28. Grev. Scot. Fl. Cr. t. 199. 

 Muse. Brit. ed. 2. p. 70. Suppl. t. 2. 



Dry rocks, at a considerable elevation on the Scottish, especially the 

 Breadalbane, mountains, plentiful, but always barren. — When dry, the 

 tufts form firm rigid masses ; when moist, the dichotomous stems are 

 exceedingly soft and flaccid, so that they can scarcely be handled with- 

 out falling down. They are of a rich deep brown colour, paler at the 

 points. G. sjriralis differs from this in its more rigid texture when 

 moist, with longer diaphanous points to the leaves, which are torquate 

 and of a blacker hue. 



*** Seta exserted, straight. 



8. G. leucophcea, Grev. (hoary Grimmia); stems rather short 

 tufted, leaves elliptical very hoary with long piliferous points, 

 seta a little longer than .the leaves, capsule ovate, teeth of 

 the peristome often bifid and perforated, lid rostrate short. 

 Grev. in Wem. Trans, v. 4. cum Ic. Hobs. Brit. 3Iosses, v. 2. 

 n. 24. Drum. Muse. Scot. v. 2. n. 30. Muse. Brit. ed. 2. p. 70. 

 Suppl. t. 3. 



On rocks of trap formation; King's Park, Edinburgh, Robert Brown, 

 Esq. At Fairhead, Ireland, on basalt. Coast of Fife, Mr. Arnott. 

 Fr. Apr. — Allied to G. pulvinata, but the seta is straight and the cap- 

 sule smooth : thus it has the leaves of G. pulvinata and the fruit of 

 G. ovata. This species seems hardly distinct from the South Ameri- 

 can G. campestris (Hook. Muse. Ex. t. 129.) 



9. G. ovdta, Web. et Mohr, (ovate Grimmia); stems more 

 or less elongated, leaves lanceolato-subulate gradually produced 

 into long diaphanous hair-like points their margins recurved, 

 seta exserted, capsule ovate, teeth of the peristome often 

 perforated and split, lid rostrate. Web. et Mohr, It. Suec. t. 2. 



/. 4. Schivaegr. Suppl. v. 1. p. 24. Drum. Muse. Scot. v. 1. 

 n. 24. Muse. Brit ed. 2. p. 71. ft 13. — Dicranum ovatum, Hedw. 

 St. Cr. v. 3. t. 34 — Dicranum ovale, Hedw. Sp. Muse. p. 140. 



