Jennings: Manual of Mosses — 31. Hypnaceae 243 



genus: leaves usually bright, glossy, yellowLsh-green, or almost pure green; 

 stem-leaves broadly elliptic-oblong, up to 2.5 mm long, concave-cucullate, 

 entire, the apex often apiculate, ecostate or the costa short .ind double, leaves 

 crowded, usually more or less erect-spreading when moist, towards the tips of 

 the stems and branches imbricate-convolute so as to make th? tips cuspidate; 

 branch-leaves smaller and relatively narrower; median leaf-cells linear-vennicu- 

 lar, about 10-15:1, the alar suddenly inflated, thin-walled, hexagonal, hyaline 

 or colored, forming a very distinct group, the apical rather abruptly shorter, 

 rounded, and incrassate: seta 4-6 cm long; capsule reddish-brown; peristome- 

 teeth orange, hyaline-bordered, the margins step-like above; cilia 3, appendicu- 

 late, slightly shorter than the narrowly cleft segments; spores mature in 

 summer, the large capsules being but rarely produced; annulus 3-seriate. 



In marshy places, swamps, and bogs; Europe, Asia, northern Africa, the 

 Argentine, and, in North America, through Canada and the northern part of 

 the United States south to New Jersey, Pennsylvania, and Iowa. Rather 

 uncommon in our region. 



Erie Co.: Under Cephalanthus thicket, border of Cranberry Pond, Presque Isle. 

 C.M.B. Sept. 3, 1934. McKean Co.: East Branch, Tema Swamp, north of Bradford, 

 January 18, 1895. D.A.B. Snyder Co.: In bog between Shamokin Dam and Richfield, 

 July 17, 1908. O.E.J, (figured). 



11. Hygrohypnum Lindberg 



Autoicous or dioicous: slender to robust, in flattish or cushion-like tufts, 

 lustrous, green to yellowish-green or golden-green: stem long, procumbent, with 

 few or no rhizoids, remotely and irregularly branched; branches ascending; 

 leaves spreading to secund or imbricate, concave, smooth to weakly plicate, 

 more or less decurrent, lance-ovatc, and acuminate or mostly broadly oval and 

 obtuse to roimded, sometimes almost orbicular, margins plane, entire or ser- 

 rate; costa mostly unequally forked, short, weak, rarely simple and long; leaf- 

 cells to the base uniformly narrowly linear-vermicular, mostly with obtuse ends, 

 smooth, the apical often shorter and rhombic, the basal yellow to orange, the 

 alar portions little or not excavate but with wider, quadrate to rectangular, 

 hyaline to colored cells forming a small but often well-defined auricular group; 

 inner perichaetial leaves erect, elongate, plicate, costa simple or forked, short: 

 seta long, reddish, drying flattened and twisted; capsule inclined to horizontal, 

 mostly oval to oblong, dorsally gibbous, drying arcuate and mostly constricted 

 below the mouth, annulate; peristome normally hypnoid; lid convex-conic. 



A genus of about 25 species in wet or moist places in cool regions; in 

 North America about 12 species have been reported; in our region at least 5 

 species, probably others to be expected. 



Key to the Species 



A. Epidermal stem-cells hyalme and enlarged; leaves usually distinctly falcate-secund 



3. H. ochraceum 



A. Epidermal stem-cells not as above B 



B. Leaves widely spreading, broadly ovate to almost orbicular, and harsh when dry 



5. H. dilatjtum 



