364 BllTACE^. [Hijpnum. 



H-^- Floioers monoecious or dicecious. 



100. H. trichophorum, Spruce. Tufts white, dark green ; 

 plants ])rostrate, much branched: leaves distichous, flattened, 

 ovate or oblong, concave, filiform-apiculate, irregularly undulate) 

 plicate lengthwise, recurved, entire on the borders, marked at 

 base by double short striae instead of nerves ; areolation loose, 

 hyaline ; perichaetial leaves flliform, acuminate, fiexuous at the 

 apex : capsule suberect or subincurved, oblong, a little con- 

 stricted under the orifice when dry and empty, slightly inflated 

 at the collura, brown, darker when old; operculum conical, in- 

 flated at base, muticous ; peristome pale, soft, the teeth linear- 

 lanceolate, sometimes bifid or irregularly perforated at the apex, 

 the segments split or lacerated between the articulations, whit- 

 ish when dry, hyaline when moist ; annulus of a triple series of 

 small cells remaining attached to the lid. — Ann. Mag. Nat. Hist, 

 ser. 3, iii. 276. Leskea pilifera^ Swartz, Summ. Veg. Scand. 41. 

 Plagiothecium piliferum, Bruch &, Schimp. Bryol. Eur. t. 496. 

 IL dentlculatwn^ var. Donianum^ Drummond JMusc. Amer. 

 n. 165. 



IIak. Portage River, British America (Brummond); Oregon (Uall). 



* * Teeth more densely urticulate ; basilar membrane broader ; 

 segments with intermediate cilia : leaves two-ranked. 



101. H. pulchellum, Dicks. Monoecious: plants small, 

 densely cespitulose, glossy green ; branches crowded, erect, 

 fastigiate : leaves crowded, subcomplanate, secund, lanceolate 

 or gradually tapering from the base to an acute point, entire, 

 ecostate : capsule suberect, oblong or obovate ; operculum short, 

 conical, obtusely apiculate; peristome pale yellow; cilia two, 

 a little shorter than the segments. — Crypt. Fasc. ii. 13, t. 5. 

 Leskea pulchdla^ Hedw. Spec. Muse. 220, t. 55. PlagiotJieciwn 

 2ndchellum, Bruch & Schimp. Bryol. Eur. t. 497. Stereodon 

 pvlcJiellus, Mitt. Journ. Linn. Soc. viii. 39. Plagiotheciwn 

 7iitidum, var sjtberectwn, Lindb. Faun. Flor. Fenn. ix. 34. 



Var. nitidulum. Plants slightly stronger and less compact : 

 leaves longer and long-acuminate : capsule thicker, ovate-oblong, 

 inclined or subcernuous. — II. nitidulum, Wahl. Fl. Lapp. 370. 

 Plagiothecium nitidulum, Bruch & Schimp. 1. c, t. 498. P, 

 nitidnm., Lindb. 1. c. Isopterygium nitidum, Lindb. Muse. 

 Scand. 39. 



