— 280 — 



36.D.Heiaiii Hedwig. — Gymnostomum H.; Didymodon Kindb.; 

 Pottia Fuernrohr. 



Leaves lanceolate or publingulate, the upper long-acuminate 

 acute, densely serrulate above, not spreading; costa us. not 

 excurrent. Capsule short subcylindrie or oval-oblong; lid systylic; 

 peristome none; pedicel red. Stem 1 — 2 c. m. or lower. Mon- 

 oecious or synoecious. — Wet soil often near sea sometimes 

 in alps. — Eur. not uncommon. Sweden, Norway! Spetsbergen: 

 Berggren. Amer. Can.: J. Macoun; Drummond; Waghorne. 

 Alaska: J. M. Macoun. 

 *D.B.yani Philibert. — Pottia Phil.; Didymodon Kindb. 



» Leaves very small, oval or short-oblong, very obtuse and 

 entire. Lid of capsule short and thick. — Eur. Norway: 

 Ryan»: Philibert revue bryol. 1896. 

 37.D.heiniioides Kindb. — Pottia Kindb. cat. Can. m. 



Leaves suboblong, the lower obtuse, the upper short-acuminate 

 acute; costa gen. excurrent. Capsule cylindric longer and nar- 

 rower than in the last; peristome present but rudimentary; pe- 

 dicel golden yellow. Stem only 2 — 3 m. m. high. Otherwise 

 as the last. — Earth in alps r. Amer. Can. Rocky mts: Ma- 

 coun. 



C. Leaves smooth distantly dentate or denticulate. 

 38.D.riparius Austin. — Pottia Aust.; Sulliv. icon, m.; Didy- 

 modon Kindb.; Barbula lingulata Warnstorf; Triohostomum 

 Warnstorffii Limpricht. 



Leaves oval-oblong or Ungulate obtuse sometimes apiculatp, 

 sparingly denticulate near apex sometimes to Y^, patent when 

 moist; only the lowest basal cells rectangular; costa not or 

 scarcely percurrent. Capsule oblong-cylindric; peristome un- 

 known; annulus broad. Stem to 3 c. m. high, sometimes with 

 propagula. — Wet rocks near water r. Eur. Switzerl.: W^eber; 

 Culmarin, com. Husnot. Atner. U. S.: Austin, com. Mrs 

 Britton. 



39.D.Macoiinii Kindb. (new name). — Leptodontiura canadense 

 Kindb. cat. Canad. m. 



Leaves lanceolate or narrowly oblong-lingulate acute, coarsely 

 dentate at least in upper half, spreading when moist; lower 

 basal cells rectangular; costa percurrent or short-excurrent. 

 Stem scarcely 1 c. m. high. Capsules and male plants un- 

 known. — Stones in rivers r. Amer. Can.: J. Macoun. 



