Grimmia.~] APLOPERISTOMI. 69 



only or split at the very extremity,) this plant has the 

 leaves very much resembling those of Trichost. patens, especially 

 our var. (3. It often grows with Gr. pulvinata, large speci- 

 mens of which it much resembles ; but the leaves are much 

 narrower, and the capsule is more deeply sulcate. 



Mr. Turner's var. j3. of Dicr. pulvinatum appears to be the 

 same as our plant, but of a smaller size. 

 6. Gr. spiralis ; stems elongate pulvinate, leaves lanceolate 



tapering into a diaphanous hair-like point, erect when moist, 



spirally twisted when dry, fruitstalks curved, capsule ovate 



smooth. (SUPPL. TAB. II.) 



Grimmia spiralis. Hook, and Taylor, in Drummond, Muse. Scot. 



v. 2. n. 29. Greville, Scot. Cr. Fl. t. 203. Am. Disp. Muse. p. 21. 



HAB. Rocks. East side of Slemish mountain, County of 

 Antrim, Ireland. Rocks on Ben Lawers abundantly, 

 where it is not unfrequent in fruit. Found on many of 

 the Grampians by Mr. Arnott and Dr. Greville, and is 

 probably not uncommon. Clova, Mr. Drumtnond, but 

 not in fruit. 



Since the publication of the first edition of this work, we 

 have determined two additional species of Grimmia which 

 are remarkable for their leaves, when dry, being spirally twisted 

 round the stem. The one we have named Gr. spiralis; for 

 the other we have adopted the MSS. name of Dr. Hornschmh, 

 who some time ago sent us a specimen of the same plant, but 

 who appeal's, like ourselves, to find it only in a barren state ; 

 Grimmia spiralis differs from Gr. torquata in its more rigid 

 habit, much longer diaphanous points to the leaves, which are, 

 moreover, not so decidedly torquate, and are of a blacker 

 colour. From Gr. ovata our plant may be known by its curved 

 fruitstalks, and from Gr. pulvinata by its lanceolate, gradually 

 tapering leaves, smooth capsule, and from both by its twisted 

 leaves ; Grimmia fusco lutea of Hook. Musci Exotici, a native of 

 South America, has the leaves longer and narrower, and al- 

 ways straight; otherwise it could scarcely be distinguished 

 from Gr. spiralis. 



In the teeth of the peristome of our plant, we perceive a 

 dark central line, and Dr. Greville finds them to be bifid or 



E3 



