— 64 — 



or less distinct; teeth yellowish; segments hyaline; pedicel very 

 short. Tufts green or yellowish. — Trees r. Amer. U. S. south, 

 states: Mohr, com. Macoun; Langlois and Sawyer, com. Gardot. 

 * R.admixtum Sullivant. — Hypnum SuU.; Raphidostegium 

 Kindb. 



Capsule arcuate more distinctly necked; pedicel longer. 

 — Trees r. Amer. »U. S.>' Lesq. et Jam. (Cuba: Wright, herb. 

 SuUiv., com. C. Mueller). 



b. Branches julaceous. Stem not radiculose. Leaves entire, 

 not or slightly recurved. 

 6.R.siibdemi$siim Kindb cat. Canad. m. 



Leaves small ovate-lanceolate long-subulate; alar cells large, 

 the others linear. Capsules unknown. Branches distant cuspi- 

 date yellowish green. Dioecious. — Rocks in arctic Pacif. 

 distr. r. Amer. Alaska: J. M. Macoun. 



T.R.marylandicum C. Mueller. — Hypnum demissum var. 

 Lq. et J. 



Leaves ovate-lanceolate subobtuse acute somewhat large; alar 

 somewhat large, the others linear. Perichetial leaves subulate- 

 acuminate. Capsule subobovate or oblong without neck, not 

 strangulate, larger than in R. demissum; endostome yellow. 

 Tufts olivaceous with green branch-tops. Plants robust. Monoe- 

 cious. — Wet rocks r. Amer. U. S.: Sull. et Lesq. musci bor. 

 amer. n. 442, com. C. Mueller. 



II. Pseudo-Plagiothecium Kindb. 



A. Leaves curved, distinctly denticulate above, from ovate- 

 oblong base narrowed to acumen. Us. dioecious. 

 S.B.laxepatulum Lesquereux et James. — Hypnum (Raphi- 

 dostegium) L. et J.; Raphidostegium Kindb.; Rhynchostegiiun 

 delicatulum James; Sulliv. icon. m. 



Leaves with somewhat long subsubulate dentate acumen; 

 perichetial strongly dentate above to below middle. Capsule 

 suboblong curved; teeth pale, pnpillose above; segments entire; 

 cilia none; pedicel very short. Stem pale or greenish red, 

 sparingly radiculose; branches distant. Tufts green. Habit of 

 Plagiothedum silvaticum. Dioecious. — Amer. r. U. S.: Purpus, 

 com. Roell. 



9.R.Lorentzii Molendo. — Hypnum M.; Raphidostegium 

 Kindb. 



Leaves with more or less long gen. subulate denticulate acu- 

 men; perichetial denticulate above. Capsule oblong slightly 

 curved; teeth golden yellow, papiUose above; segments rimose; 

 cilia long; pedicel not long. Stem red sparingly radiculose; 



