— 47 — 



Leaves brittle from siibovate base contracted to a sublinear 

 obtuse acumen, denticulate all around, distant but not decurrent; 

 cells round-hexagonal except some oblong near the simple costa. 

 Tufts loose blackish green when dry. — Rocks and trees r. 

 Eur. Ital_y, Switzerl.! Amer. U. S.: Austin, com. Macoun; James, 

 com. Boswell. 

 S.H.frullaniopsis C. M. et Kindb. cat. Canad. m. 



Leaves not brittle, round-oval obtusate cochleariform, minu- 

 tely denticulate above middle, decurrent; upper cells rhombic, 

 lower oblong; costa more or less distinct, sometimes stout and 

 simple. Tufts dark green. — Trees r. Amer. Can. N. Brunsw.: 

 Moser, com. Macoun. 



43. Pseudoleskeella Kindb., new genus. 



A. Leaves distinctly denticulate. 



a. Leaves dimorphous; those of stem acuminate acute. 

 LP.heteroptera Bruch. — Pterogonium Bruch; Heterocladium 

 Br. eur. 



Leaves opake very papillose, ovate-oblong serrulate all around, 

 slightly recurved near base; cells gen. rotundate-quadrate. 

 Stem-leaves gen. longer-acuminate; inner basal cells elongate; 

 costa pellucid us. double. Branch-leaves subdistant often ob- 

 tuse. Capsule small suboval sometimes erect; teeth pale, seg- 

 ments rimose as high; cilia long; lid obliquely rostrate; pedicel 

 short. Stem r. subpinnate; branches attenuate or acute, fasci- 

 culate or distant, often flagellate. Dioecious very r. fruiting. 

 — Rocks r. Eur. Sweden, Switzerl. I Amer. Pacif. distr. Can.: 

 Macoun; Drummond n. 219. U. S.: Roell, com. Cardot. 

 2.P.Tancouveriensis Kindb.; Thuidium bull. Torr. club XVII; 

 Heterocladium rat. Canad. m. 



Differs from the last: Leaves pellucid faintly papillose, below 

 middle entire and often recurved; cells larger gen. more rotun- 

 date or suboval; costa of stem-leaves simple opake. Capsule 

 sometimes horizontal; lid conic acuminate. Stem subpinnate; 

 branches short r. flagellate. Monoecious. — Rocks r. Amer. 

 Pacif. distr. Can.: Macoun. U. S.: Roell, com. Cardot. 

 S.P.denticulata Sullivant. — Leskea Sull. ic. m.; Hypnum 

 fabronisefolium C. M. syn. 



Leaves pellucid faintly papillose minutely denticulate nearly 

 all around; alar cells quadrate sometimes dilated, marginal 

 rhombic, the others gen. suboblong; costa double very short 

 or indistinct. Stem-leaves from round-ovate base abruptly 

 long-acuminate; branch-leaves subovate short-acuminate concave 



