232 A MAXUAL OF MOSSES 



branch-leaves subfalcate, second, erect-spreading to imbricate 

 when dry. lance-ovate, entire below, sub-denticulate above, 

 acuminate, concave, ecostate or faintly costate at base; leaf- 

 cells linear-rhomboidal, 6-8:1, quadrate alar cells numerous, 

 incrassate, extending up the margin : seta short, erect ; capsule 

 oblong, about 2.5-3.5 mm. long, about 3-4:1, erect; lid shortly 

 rostrate ; annulus narro\v ; peristome-teeth lance-linear, seg- 

 ments free, basal membrane distinct, cilia none ; spores about 

 .OOS-.012 mm. in diameter, mature in autumn. 



On bases of trees and on rocks, in woods, from New Eng- 

 land to Illinois, south to the Gulf States and to New Mexico. 

 Not yet found in our region. 



4. Pylaisia polyantha [Schreber] Bryologia Europcea. 



(Leskea polyantha Hedwig). 



Intricately matted, yellowish-green : stems prostrate, root- 

 ing on bark, not stoloniform, up to 6 or 8 cm. long, with 

 numerous erect or ascending, curved branches about 0.5-1 cm. 

 long; branch-leaves erect and secund or pointing upwards, 

 when dry loosely imbricate, small, lanceolate, rapidly narrowed 

 into a tapering acumination of about same length as the body 

 of the leaf, entire, slightly concave, non-plicate, plane-mar- 

 gined, 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 distinct; stem-leaves 

 somewhat broader and more abruptly acuminate : seta about 

 1.5 cm. high; capsule 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, somewhat 

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

 granulose, somewhat split when old ; spores mature in fall or 

 winter, about .012-.016 mm. 



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

 lower Canada and the northeastern United States. Apparent- 

 ly rare in our region. 



McKean : Bradford. D. A. Burnett. (Porter's Cata- 



logue). 



5. PTERYGYNANDRUM Hedwig. 



Dioicous ; slender to quite robust, variously cespitose, 

 green to yellowish-green, dull or lustrous, primary stem stolon- 

 like, irregularly radiculose; secondary stems secund, filiform- 

 julaceous, the base stolon-like, radiculose, often flagelliform, 

 densely-leaved, ascending, forked, bushy or pinnately 

 branched ; leaves imbricate, sometimes secund, some\vhat de- 

 current, non-plicate, deeply concave, ovate to oval, short-acute 

 to subulate-acuminate, margins narrowly revolute to the 

 middle or above, entire or serrulate upwards ; costa usually 



