VERMONT MOSSES. 



27 



HYLOCOMIUM Br. & Sch. 



I. — Paraphyllia lacking. 



Paraphyllia present. 

 2. — I^eaves bicostate. 



Leaves unicostate to middle. 

 3.— Plants regularly 2-3 pinnate, 



Plants irregularly or pinnately branching. 

 4.- Stem leaves loosely erect. 



Stem leaves squarrose-spreading. 



triquelrum 

 2, 



3 



Pyrenaicuiri 



proliferum 



4 

 umbratum 

 brevirostre 



H. brevirostre (Ehrh.) Br. & Sch. Shore of Lake Memphrcmagog near 

 Mountain House, Owl's Head Mt., Canada, i^.; only a few miles 

 north of the Vermont line and undoubtedly occurs within the 

 State. Reported b}^ Frost but no specimen has been seen. 



H. Pyrenaicum (Spruce) Lindb. [H. Oakesii BuWiv.) Stowe, P.; Mt. 

 Hor and Willoughby Mt., F. 



H. proliferum (L. ) Lindb. {H. splendensHedw.) On decaying logs, 

 stumps, earth and stones in cool moist woods, especially in moun- 

 tain regions. 



H. triquetrum (L. ) Br. & Sch. On soil and decaying wood in damp shady 

 places; common. 



H. umbratum (Ehrh.) Br. & Sch. Abundant on earth and rocks, in 

 mountain woods ; seldom fruiting. Mt. Mansfield, P.; Stratton 

 Mt., G.; Brattleboro, Fr.; Mt. Hor, F. 



HYPNUM Dill. 



I.— Leaves spreading or complanate, not secuud. 2. 



Leaves secuud. 12. 



2.— Costa extending to middle of leaf or beyond. 3. 



Costa very short and double or none. 6. 



3.— Leaves acute or acuminate. palustre. 



Leaves obtuse, entire. " 4. 



4.— Costa subpercurrent. cordifolium. 



Costa reaching middle of leaf. 5. 



5.— Branches irregularly pinnate ; leaves spreading. Richardsoni. 



Branches few, leaves imbricate. stramineum. 



6.— Alar cells abruptly enlarged (often inflated or colored. ) 7. 



Alar cells scarcely different or quadrate or rectangular, not abruptly enlarged. 10. 



7-— Operculum short-rostrate. Haldanianum. 



Operculum convex or conic. 8. 



