GRIMMIA. 117 



agreeable contrast to the patches of emerakl green, amid 

 which it often happens to vegetate. 



GRIMMIA, Ehrli. (Grimmia.) 



Named in honour of Dr. T. C. Grimm, a German botanist. 

 "This genus bears the same relation to Weissla that Tri- 

 chostomum does to Bklijmodon ; its essential distinguish- 

 ing character residing in the mitriform calyptra." Some 

 species are of a peculiarly lurid blackish-green coloiu", and 

 the foHage of others is marked by their long diaphanous 

 points. 



Generic Character. — Seta terminal. Peristome of sixteen en- 

 tire or perforated, rarely cleft, equidistant teeth. Calyptra mi- 

 triform. 



* Fruit sessile, or nearly so. 



1. Grimmia APOCARP A, Hedw. {Sessile Grimmia.) Stems 

 branched; leaves ovato-lanceolate, recurvo-patent, their 

 margins reflexed, those of the perichsetium having the nerve 

 disappearing immediately below their summits; capsule 

 ovate, sessile ; lid shortly rostrate. — Mig. Fl. p. 24 ; Milll. 

 Syn.pt. 1. J??. 776. Schistidium of Br. and Sch. and others. 



On rocks, stones, wall-tops, and trees, abundant. Fr, 



