312 FRYE 



Upper leaves spreading, loosely incumbent when dry, similar to 

 those of P. gracile but larger, 10-15 mm. long. Margin erect, 

 sharply serrate, very narrow, of 2-3 rows of smaller cells (.010- 

 .012 mm.). Lamellae about 50-70, very low, 3-5 cells high; mar- 

 ginal ceils smooth, round, equal or slightly larger tnan tne otners ana 

 sometimes a little longer than broad. Vein excurrent; point red, 

 short, dentate. Cells of leaf-base longer and narrower than in P. 

 gracile, very narrow at margin, near middle toward vein width to 

 length about as i : 6-10. Perichaetial leaves with long sheaths, 

 longly acuminate. 



Calyptra covering capsule. 



Capsule erect or inclined, cernuous when dry, oblong, with 5-6 

 (rarely 4) acute angles, yellow-green, fawn-colored when ripe, wide- 

 mouthed, cells of surface turgidly mamillose, smooth; hypophysis 

 small, distinct, constricted above. Lid large, with rather long 

 beak. Spores .010 - .014 mm. Pedicel 5-6 cm. long, stout, rigid, 

 orange below and paler above. — On soil and rocks. — From Alaska 

 Peninsula southward along the coast, Ravelstoke and Selkirk 

 Mountains in British Columbia; Oregon; Pelee Point on Lake Erie 

 in eastern Canada; Miquelon Island; Europe; Japan. 



3. Polytrichum ohioense R. & C, in Rev. Bryol., 1885, 

 p. II. 



Name derived from Ohio in which state it was first found. 

 Plants erect, 3-6 cm. high. Stems simple or bipartite. 



Leaves spreading when moist, erect-flexuous when dry, cuspidate^ 

 linear-acuminate from a sheathing base. Margin plane or erect' 

 serrate. Lam.ellas about 50, 5-7 cells high; luarginai ceiis mucn 

 larger than the others, broader than long as i|-2 : i, slightly con- 

 vex or plane. Vein excurrent in a red dentate point. Perichaetial 

 leaves longer, with a longer hyaline base. 



Capsule erect, finally horizontal, acutely 4-5 angled, rarely 6 

 angled, smooth, rather narrow towards the base, 2-2^ mm. wide, 

 5-7 mm. long; hypophysis very small or indistinct. Lid conic- 

 acuminate, red at margin. Pedicel 4-6 cm. long, reddish below, 

 pale above. -^ — On soil. — Ravelstoke, British Columbia; eastern 

 British Columbia; northeastern United States. 



^ Examination of material from Alaska, eastern United States and Europe shows 

 that P. ohioense cannot be distinguished from P. attenuatum by the form of the capsule 



