— 44 — 



2.T.Leibergii Britton. 



Differs from the last: Leaves broader, those of branches 

 broadly oval-oblong less acuminate; cells larger, middle oval, 

 lower oblong-linear; costa shorter. Capsule suboval; pedicel 

 somewhat short. — Damp rocks r. Amer. Can.: Macoun. U. S.: 

 Roell; Leiberg, com. Mrs Britton. 



S.T.alleghaniense C. Mueller. — Hypnum C. M.; Sulliv. icon. 

 m.; Thamnium Schimper. 



Branches turgid. Middle stem-leaves ovate obtu.'ie often fim- 

 briate above; branchleaves suboval obtusate subacute very con- 

 cave; cells not much larger than in T. alopecurum, middle oval, 

 inner basal oblong-linear; costa thick nearly smooth not much 

 long. Capsule suboblong; pedicel curved not long. Sometimes 

 synoecious or monoecious. — Damp rocks and shaded banks. 

 Amer. not r. Can. r.: Macoun. U. S.: Austin, com. Macoun. 



b. Stem-leaves broadlv ovate-lanceolate. Capsules unknown. 

 4.T.TOCCO8B Sullivant et Lesquereux. — Anomodon S. et Lq.; 

 Sull. icon, muse; Thamnium Kindb. 



Branches turgid often curved. Leaves sharply serrate or 

 fimbriate above; cells verj' small nearly all uniform seriate; 

 costa smooth subpercurrent. Stem-leaves acute with short 

 acumen or point, faintl}- recurved below; inner cells suboval, 

 few apical sometimes sublinear. Branch-leaves smaller narro- 

 wer locger-acumiuate more distinctly recurved. Perichetial 

 leaves narrow filiform -pointed costate. — Rocks r. Amer. U. S. 

 Georgia: Lesquereux, com. Renauld; Small, com. Roell. 



C. Leaves narrow, those of stem lanceolate-linear, those of 

 branches sublanceolate. Capsules unknown. 

 5.T.angustifolium Holt. 



Middle stem-leaves acuminate serrate; middle and lower cells 

 suboval; costa thick very broad below. Branches more slender 

 than in T. alopecurum. — Wet rocks r. Eur. Engl.: G. A. Holt. 



B. Leaves small narrow sharply serrate all around; cost;i 

 dentate at back in its whole length, percurrent or subexcurrent. 

 Capsules unknown. 

 e.T.micro-alopecurum Kindb. rev. bryol. 1896. 



Leaves suboblong decurrent: cells nearly uniform round- 

 rhombic or subquadi-ate; costa narrow. Stem low; branches 

 turgid. — Amer. r. U. S. Oregon: J. A. Hertzman, com. E. 

 Nyman 1886. 



