108 HYPNACEAE 



Plants not yellowish, often dark green; costa evident, often reaching 

 the middle of the leaf; growing in cool ravines and on mountains. 



elegans 



EUPLAGIOTHECIUM 



I — Leaves not complanate, squarrose-spreading; capsule strongly 



striate striatellum 



Leaves complanate (excl. Roeseanum) 2 



2 — Plants very slender with habit and appearance of Isopterygium; 



capsules erect and symmetric; peristomes without cilia. . . .latebricolor 



Plants more robust with the habit of P. denticulatum 3 



3 — Not complanate or only slightly so Roeseanum 



Conspicuously complanate 4 



4 — Plants dingy or yellowish-green; leaves shrunken when dry; dioicous; 



operculum rostrate sylvaticum 



Plants bright green; monoicous; operculum conic 5 



5 — Edges of leaves strongly incurved and clasping the base of the leaf 



above, Fissidens-fashion. Plants of swamps Ruthei 



Leaves not as above or to only a slight degree; plants of varied habitat 



denticulatum 



P. deplanatum (Sch.) Grout. Closter, N. J., Austin, Bx!; 

 "Palisades, N. J.," Muse. App. 344. [Dr. Best has called this 

 P. silesiacum (Selig.) B. & S.]. Rarely fertile. 



P. denticulatum (L.) B. & S. Very common on moist soil, 

 stones, etc., in woods. Summer. Forma propagulifera Ruthe, 

 swamp, Valley Stream, L. Id. 



P. elegans (Hook.) Sull. "Crevices of shaded rocks, north- 

 ern N. J.," Muse. App. 348, also. 350 from Suffern, N. Y., as 

 var. gracilens. 



P. geophilum (Aust.) Grout. "On clayey shaded ground, 

 N. J.," Muse. App. 345; Richmond, S. Id.!! Spring. 



P. Groutii Card. & Ther. Type from hollow in base of 

 chestnut tree, Hempstead, L. Id. A subspecies of P. micans. 



P. latebricolor (Wils.) B. & S. "About the roots of old 

 stumps, etc., in swamps near Closter, N. J.," Muse. App. 353. 

 Flushing, L. Id.!! Rare; autumn. 



P. micans (Sw.) Paris. Frequent on rotten wood and soil 

 at base of trees. Lawrence, L. Id.!!; Ocean Terrace, S. Id.; 

 Closter, N. J.; Pelham Parkway, the Bronx. January. 



