— 278 — 



Switzerl., Norway! France: Le Jolis. Amer. Can.: Macoun. 

 U. S.: Henderson, com. Cardot. 



b. Leaves smooth. Peristome often rudimentary. 

 25.D.Iaridas Hornschuch. — Trichostomum Spruce. 



Leaves ovate oblong or broadly ovate-lanceolate acute, nearly 

 appressed when dry; cells short; costa percurrent. Capsule oval- 

 oblong or subcyliudric; pedicel red. Tufts finally lurid-brown. 

 — Rocks and stonewalls. Eur. not r. in warmer distr. Swit- 

 zerl.! Engl.: Holt. France: Husnot. Germany: Herpell. Amer. r. 

 Can.: Macoun. U. S.: Mrs L. C. Feely. 

 26.D.Laiiiyi Schimper; Husnot. 



Difiers from the last: Leaves slightly crisped; basal cells long 

 hj'aline; costa shghtly excurrent. Pedicel yellow above. Tufts 

 dark gieen. — Rocks r. Eur. France: Lamy, com. Husnot. 

 27.D.COrdatus Juratzka. — Trichostomum Milde. 



Leaves broader than in D. luridus, subcordate at base, cur- 

 ved when dry, often short subovate; costa percurrent or slightly 

 excurrent. Tufts green often "with propagula. Capsules un- 

 known. — Schistose and calcareous rocks r. Eur. Switzerl.! 

 Italy: E. Adlerz. Germany: Herpell. 



B. Leaves narrowly acuminate. 



a. Leaves gen. papillose, faintly twisted when dry. Tufts 

 us. low and fuscescent. 

 28.D.rigidulus Hedwig. — Barbula Mitten. 



Leaves from long ovate-lanceolate base tapering to the nar- 

 row nearly as long acumen, with thick reflexed borders, nearly 

 straight when moist; the upper part of acumen nearly filled by 

 costa; lower basal cells often long. Capsule oval-oblong or 

 cylindric; teeth not contorted but us. faintly twisted; pedicel 

 red. — Rocks and stonewalls. Eur. not r. Sweden, Norway, 

 Switzerl.! Scotl.: Fergusson. Amer. r. Can.: Macoun. U. S.: 

 Roell. 

 29.D.vaUdus Limpricht. 



Leaves smooth ft.-om ovate-oblong base tapering to a not long 

 acumen, gen. with thick reflexed borders, nearly straight when 

 moist; cells gen. short; costa thick often long-excurreut. Cap- 

 sules unknown. Tufts brown loosely cohering, about 1 c. m. 

 high (»5 c. m. or more*: Limpricht). — Calcareous alp. rocks r. 

 Eur. Austria: Gander. 

 SO.D.Dieckii Brotherus. — Barbula Broth.; Didymodon Kindb. 



Leaves from broad ovate-oblong base abruptly narrowed to 

 the subulate not longer acumen, flat above, not or slightly 



