Jennings: Manual of Mosses — 31. Hypnaceae 229 



York and New Jersey to Illinois and Minnesota, south to North Carohna 

 and New Mexico. Net yet found in our region. 



4. Pylaisia POLYANTHA [Schreber] Bryologia Europaea 

 (Leskea polyantha Hedwig) 



Intricately matted, yellowish-green: stems prostrate, rooting on bark, not 

 stoloniform, up to 6 or 8 cm long, with numerous erect or ascending, curved 

 branches about 0.5-1 cm lon^r; branch-leaves erect and secund or poi itin'^ up- 

 wards, when dry loosely imbricate, small, ovate-lanceolate, rapidly narrowed 

 into a tapering acumination of about same length as the body of the leaf, 

 entire, slightly concave, non-plicate, plane-margined, ecostate or with a very 

 short and faint double or single nerve; median leaf-cells thin-walled, about 

 6-10:1, the alar few, quadrate, pellucid, rather broad and distmct; stem-leaves 

 somewhat broader and more abruptly acuminate: seta about 1.5 cm high; cap- 

 sule oblong-cylindric, about 3.5-4:1, about 2.5 mm long; lid conic, acute, short; 

 annulus single, narrow; peristome-teeth lance-linear, closely articulate, some- 

 what granular above, segments about as long as teeth, lance-linear, granulose, 

 somewhat split when old; cilia single, usually rudimentary; spores mature in 

 fall or winter, about .01 2-. 01 6 mm. 



On tree trunks and in hedges, etc.; Europe, Asia, and in lower Canada and 

 the northern United States. 



Apparently rare in our region. McKean Co.: Bradford. D. A. Burnett, (Porter's 

 Catalogue ) . 



5. PlaTYGYRIUM Bryologia Europaea 



Dioicous, medium size, flatly cespitose, green to golden or brownish-green, 

 lustrous: stem elongate, creeping, ventrally densely radiculose, thickly-leaved 

 and unsymmetrically pinnate; branches julaceous, mostly short, simple; leaves 

 imbricate when dry, moist spreading, decurrent, non-plicate, ovate to oblong- 

 lanceolate, sharply acute, smooth, margins revolute; costa short and double or 

 none; apical cells rhomboid, linear below, alar quite large, numerous, quadrate; 

 seta 8-15 mm, sometimes 20 mm, smooth, castaneous; capsule erect, .-.ymmetric 

 or slightly arcuate, narrowly oblong to almost cylindric; annulus broad, pluri- 

 seriate, revoluble entire or sometimes in pieces; peristome inserted on the 

 mouth, double; teeth lance-linear, yellow, broadly bordered, non-striate, trabec- 

 ulae thickened; basal membrane not prominent, segments narrowly linear, cari- 

 nately cleft, cilia none; spores .012-018 mm, lid conic, shortly and obliquelv 

 rostrate. A widely distributed genus of about 4 species; one species in North 

 America. 



1. PlaTYGYRIUM repens [Bridel] Bryologia Europaea 



{Pterogonium repens Schwaegrichen; Anomodon repens Fuernrohr; 

 Cylindrothecium repens DeNotaris; Entodon repens Grout ) 



Plate XXXVII 



Densely but thinly matted, bright to dark green, pinnately branching: 

 leaves ecostate, crowded, erect-spreading when moist, imbricate when dry, con- 



