— B92 — 



B. Leaves costate, not appressed when dry, often falcate. 



2. Nivales. Leaves papillose, crisped or flexuoue when dry; 

 the perichetial costate. Dioecious, r. fruiting. 



3. Rupestres. Leaves smooth or (sometimes in A. frigida) 

 faintly mamillose, not crisped: inner perichetial convolute and 

 (exc. A. Bothii) nerveless. Monoecious. 



1. Petrophite. 

 A. Leaves hroader above base, somewhat large; perichetial 

 obtusate. Stem often longish. 



a. Leaves slightly crenulate at base; cells small. 

 l.A.alpiua L. — Jungermania L.; Andresea Smith. 



Leaves short-acuminate obtuse crowded nearly smooth, us. 

 appressed when dry. Tufts blackish; stem erect not much 

 high. — Rocks near Atlantic sea r. Eur. Norway! R. Hartman; 

 F. Kiser. 



b. Leaves entire; cells somewhat large. 



2.A.Htartinani Schimper. 



Leaves large gen. obtusate and distant, nearly smooth and 

 not appressed. Tufts brownish. Stem us. very long and floa- 

 ting. — Stones in rivulets in northern alps r. Eur. Norwayl 

 Sweden: K. F. Thedenius. 



*A.Thedenii Schimper. 



Leaves less large and more distinctly acuminate, crowded, 

 faintly papillose, often appressed. Tufts blackish brown; stem 

 erect not much high. — Wet rocks in norther alps r. Eur, 

 Norwayl 

 S.A.obovata Thedenius. 



Leaves less large gen. long-acuminate, crowded, distinctly 

 papillose and appressed, reddish or browu-red when moist. 

 Tufts blackish when dry; stem erect not much high. — Wet 

 rocks in northern alps r, Eur. Norway! Sweden: R. Hartman. 

 Finl.: Brotherus. Amer. Greenl.: Berggren. 



Ji. Leaves broader near base, gen. small and appressed 

 when dry; perichetial sometimes acuminate. Tufts loose; stem 

 erect. 

 4.A.petrophila Ehrhart. 



Leaves ovate oblong or ovate-lanceolate acuminate gen. sub- 

 obtuse distinctly papillose and crowded: inner perichetial us. 

 obtusate. Tufts gen. brown and low. — Siliceous rocks com- 

 mon. Eur. Sweden, Noi-way, Switzerl.! Spain: Levier. Amer. 

 Can.: Macoun; Waghorne. 



