HYPNACEAE 1 1 1 



somewhat flattened. Leaves nearly entire or very slightly ser- 

 rate at apex, very concave, not striate or plicate when dry, ecostate 

 or with costa very short and double; leaf cells linear, enlarged 

 and quadrate at the basal angles: capsules cylindric, erect and 

 symmetric; operculum conic to conic-rostrate, annulus usually 

 large and conspicuous, remaining attached longer than is usually 

 the case; peristome w'th cilia rudimentary or wanting and seg- 

 ments narrow, basal membrane usually very narrow. 



Their brilliant color and flattened habit (julaceous in E. 

 seductrix) render this genus easy of recognition. The leaves are 

 so much nearer together than in most other flattened forms 

 that one is not likely to put them with forms like Plagiothecium. 

 In fruit Brachythecium acuminatum is our only moss likely to be 

 misplaced in this genus. 



Key 



I — Leaves gradually narrowly acuminate; segments of endostome ad- 

 hering to the teeth brevisetus 



Leaves merely acute or apiculate, segments free 2 



2 — Leafy stems and branches rounded (terete) seductrix 



Leafy stems flattened 3 



Plants robust; capsules 3— 5mm long, 5—6:1, peristome teeth not 



papillose above cladorrhizans 



Plants more slender; capsules 2.5mm long, 4:1, teeth papil- 

 lose compressus 



E. brevisetus (Hook & Wils.) J. & S. "On leaning trunks of 

 trees, old logs and stone fences; also on rocks associated with 

 Dicranum scoparium var. rupestre, Palisades and northern N. 

 J.," Muse. App. 285. 



E. cladorrhizans (Hedw.) C. M. Cold Spring (25906)!! and 

 Northport, Sanial on L. Id.; "Palisades and northern N. J.," 

 Muse. App. 284. Autumn. Much of the local material at the 

 Bronx is E. seductrix. 



E. compressus (Hedw.) C. M. "On decayed stumps of 

 trees, Weehawk, N. J.," labeled in Torrey's handwriting in the 

 Torrey Herbarium at the Bronx. 



E. seductrix (Hedw.) C. M. Common. A specimen from 

 Barnes' Woods, S. Id., E. G. B., Bx! resembles E. compressus 

 in appearance and should probably be referred to var. Demetrii 



