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IV. Rhytidium Sullivant. 

 26.H.rugosum Ehrhart. 



Leaves large denticulate nearly all around from subovate 

 base gen. long-subulate; costa vanishing near or above middle. 

 Capsule subcylindric arcuate; teeth ferruginous; lid acute or 

 rostellate; pedicel not long. Tufts loose, brown below, golden 

 glossy or greenish above. Branches subjulaceous very thick. 

 Dioecious r. fruiting — Dry earth and rocks. Eur. common 

 in alps, r. in lower districts. Norway fruit., Switzerl.! Ger- 

 many fruit.: Schimper. Amer. Can.: Macoun; Waghorne. 

 V. Pseudo-Hylocomium Kindb. 



A. Angular leaf-cells large numerous hexagonal-oval. 

 27.H.squarrosum L. — Hylocomium Br. eur. 



Leaves minutely denticulate all around from ovate base long- 

 acuminate; angular cells sometimes brown. Perichetial leaves 

 pale yellow gradually acuminate filiform-pointed, serrate above 

 middle of the basal part. Capsule broad-oval or obovate or 

 curved us. not large; teeth brown-yellow; cilia often appendi- 

 culate; lid acute; pedicel very long. Stem eradiculose r. pin- 

 nate. Tufts us. dirty greenish. — Humid meadows. Eur. gen. 

 common below alp. regions. Sweden, Switzerl.! Amer. not 

 common. Alaska: J. M. Macoun. Can.: J. Macoun. U. S.: 

 Roell (forma subpinnata). 



B. Angular leaf-cells suboblong small not well-defined. 

 28.H.loreum L. — Hylocomium Br. eur. 



Leaves from ovate base long-acuminate. Stem-leaves entire 

 below middle; branch-leaves denticulate nearly all around. 

 Perichetial leaves hyaline, slightly denticulate above. Capsule 

 large oval or subglobose; teeth brown; cilia not appendiculate; 

 pedicel long. Stem often very long and decumbent; branches 

 radiculose. — Earth and rocks princ. near sea or larger lakes 

 not r. Eiir. Sweden, Norway, Germany! Amer. Alaska; J. M. 

 Macoun. Can.: Macoun; Dawson. 

 29.H.vobustum Hooker. — Hylocomium Flemmingii Austin. 



Leaves ovate short acuminate denticulate, rugose when dry, 

 larger than in the both last and less curved; the younger 

 narrower, the elder often covered by hair-like rhizoids. Capsule 

 large subobovate oblique or slightly curved; teeth yellow or 

 finally ferruginous; lid conic obtuse; pedicel shortish. Stem 

 suberect; branches few distant very thick us. green. Habit of 

 Hypnum rugosum but larger. — Eai-th in woods r. Amer. 

 western slope. Can.: Macoun. U. S.: Leiberg, com. Mrs Britten. 



