Grimmiace^.] 



[Grimmia. 



Sect. 2. EUGRIMMIA. Plants short, in rounded cush 

 exserted, small-mouthed ; teeth lanceolate, cleft or perforated, 

 rounded-quadrate above, elongate or rectangular at base. 



Capsule ventricose on one side, immersed, on a very short curved seta. 

 Calyptra mitrasform, capsule gymnostomous. 



cucuUate, capsule peristomate. 



Capsule symmetric, exserted. 

 Seta curved. 



Leaves curled and incurved when dry, subulate. 

 Leaves spirally twisted when dry. 



Hair point long, lower cells sinuose. 



short, lower cells elongate oval. 



Leaves erecto-incumbent when dry. 

 Autoicous. 



Tall, laxly tufted, leaves gradually ending in a 



longish hair. 

 Short, densely pulvinate, leaves suddenly hair-pointed. 



ions, capsule 

 Leaf cells 



anodon. 

 crinita. 



funaUs. 

 torquatn. 



decipiens. 



Calyptra mitrseform. 



Very short, densely pulvinate, capsule pale. 

 Taller, laxly tufted, capsule brown. 

 Hair nearly smooth. 



Grey-green, hoary, hair long. 



Basal cells narrowly rectangular. 



— ^ sinuoso-rectangular. 



Fuscous-black, hair very short. 

 Hair rough and spinulose. 



Doni't. 



ovalis. 

 microcarpa. 

 elongata. 

 campestris. 



Sect. 3. DRYPTODON. Plants tall, regularly dichotomously branched 



and fastigiate ; teeth more deeply cleft, lower leaf-cells often sinuoso-crenulate. 



Calyptra cucuUate. 



Leaves lanceolate, rather acute. 

 - lineal-ligulate, obtuse. 



atrata. 

 unicolor. 



Calyptra mitrasform. 

 Short, seta straight. 

 Taller, seta arcuate. 



Sect. 4. TRICHOSTOMUM. 

 short lateral often fasciculate ramuli ; 

 late ; teeth cleft into two filiform legs. 



Leaves muticous.' 



Leaves short, broad, very obtuse. 



narrower, acuminate. 



Tall and robust, lower cells long, nodulose. 

 Upper cells quadrate. 



sinuose. 



Short, lower cells short, sinuose. 



elliptica. 

 patens. 



Plants tall, robust, with numerous 

 lower leaf-cells narrow, sinuose-crenu- 



acicularis. 



aquatica. 



fascicularis. 



obtusa. 



