— 315 — 



I. Eu-Zygodon. 



A. Leaves eublinear apiculate us. not falcate; cells not opake. 

 Tufts small low. 



a. Costa of leaves not excurrent. Capsule suboval. 

 l.Z.Tiridissimus Dickson. — Br3'um Dicks.; Zygodon R. Brown. 



Leaves gen. complicate above, r. dentate near apex, patent 

 or curved when moist, green when dry. Capsule with short 

 neck; teeth none. Often with propagula. — Trees. Eur. not 

 r. France: Le Jolis. Amer. r. Can. Vane. isL: Maooun; Drum- 

 mond 27. 

 *Z.rupestris Lindb. 



Leaves narrower with longer pellucid terminal cell (point), 

 often falcate, us. brown when dry. — Rocks somewhat r. Eur. 

 Sweden I 



2.Z.conoideus Dickson. — Bryum Dicks.; Zygodon Hooker et 

 Taylor; Z. Brebissoni Br. eur. 



Leaves entire not complicate above, suberect when moist; 

 cells larger than in the last. Capsule with longer and narro- 

 wer neck; peristome double. — Trees r. Eur. Engl.: Holt. 

 France: Brebisson; Le Jolis; Camus. Amer. »U. S.»: Cardot. 



b. Leaves with excurrent costa. Capsule round-oval; teeth 

 none. 



S.Z.Stirtoni Schimper; Braithwaite. 



Leaves entire gen. not complicate above, suberect when moist. 

 Often with propagula. — Rocks and stonewalls r. Eur. Engl.: 

 Holt. Sweden: Berggren. 



B. Leaves ovate-lanceolate dentate above, falcate when moist; 

 upper cells small opake; costa not excurrent. Tufts large; 

 stem long. 



4.Z. gracilis Wilson; Braithwaite. 



Leaves broadly long-acuminate. Capsule cylindric with short 

 neck; peristome double. Tufts dark green. Habit of Barhula 

 reflexa. — Calcareous rocks r. Eur. Engl.: Rogers; Holt. 

 S.Z.SulliTaiitii C. Mueller; SuUivant ic. m. 



Leaves subulate-acuminate. Capsules unknown. Tufts brown- 

 yellow. — Rocks r Amer. »U. S.»: SuUivant. 



n. Gymnocephalus Schwaegrichen. 

 6.Z.Forsteri Dickson. — Bryum Dicks.; Zygodon Wilson. 



Leaves flaccid entire sublingulate acute or short-acuminate; 

 upper cells roundish, the hyaline basal rectangular; costa us. 

 subpercurrent. Capsule piriform or oblong-cylindric with 

 long neck; peristome double. Tufts small. — On bark of 



