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b!). Leaves entire not sheathing. Tufts dense. 



IV. Desmatodon. Leaves short broad gen. reflexed, crisped; 

 basal cells long somewhat large and hyaline; costa often long- 

 excnrrent. Peristome straight. Habit of Barbula (Zygotrichia). 

 Often monoecious. 



V. Eu-]>idyniodon. Leaves reflexed us. short, r. twisted when 

 dry; cells small gen. short, the inner basal us. rectangular 

 yellowish; costa gen. not or slightly excurrent. Peristome some- 

 times twisted. Habit of Barbula (Eu-Barbula). Dioecious often 

 sterile. 



B. Leaves gen. denticulate, not imbricate, sometimes with 

 propagula; cells somewhat large; costa not or shortly excurrent. 

 Peristome r. present. Us. dioecious. 



VI. Leptodontium. Leaves dentate or denticulate, often not re- 

 flexed, gen. broad and obtusate, often crisped when dry; basal 

 cells at least the lowest rectangular hyaline. 



VII. Hydrogoniuni. Differs fi-om subg. Leptodontium in entire 

 leaves. 



I. Stegonia Venturi revue bryol. 

 l.D.latifolins SchwECgrichen. — Weisia Schw.; Didymodon 

 Kindb.; Pottia C. M. 



Leaves orbicular or subcochleariform gen. obtuse, sometimes 

 apiculate or with long hairpoint; upper cells subrhombic, the 

 lower hyaline longer; costa abbreviate or percurrent. Capsule 

 suboval or subcylindric; teeth pale red. Spores 0,03 — 0,04 m. m. 

 Tufts low green somewhat silver-like. — Earth on alp. rocks. 

 Eur. less r. Norway, Switzerl.l Austria: Breidler. Amer. r. 

 Can.: Macoun; Drummond 70. 



II. Trichostomum Hedwig, in part. 

 1. Pusilli. 

 2.D.trinmphan8 Notaris. — Trichostomum Not.; Didymodon 

 Kindb. 



Leaves lanceolate-linear acute or obtuse; costa short-excurrent. 

 Perichetial leaves sheathing. Capsule oval; pedicel pale yellow 

 or at base reddish. — Earth and walls r. Eur. princ. in Me- 

 diterr. distr. France: Philibert. 



* D.monspeliensis Schimper. — Trichostomum Sch.; Didymodon 

 Kindb. 



Leaves concave, the perichetial with percurrent costa. Annulus 

 simple. — Eur. r. »France»: Schimper. 



* D.Philiberti Schimper, — Trichostomum Sch.; Didymodon 

 Kindb. - 



