Jennings: Manual of Mosses — 31. Hypnaceae 227 



rhombic, smooth, alar numerous, quadrate: seta 1-2 cm long, castaneous, dry- 

 ing twisted, smooth; capsule erect, symmetric, rarely somewhat curved, oval 

 to oblong-cyHndric, collum short; annulus small-celled or none; peristome 

 deeply inserted; teeth lance-subulate, at the ap>ex often irregular and some- 

 times remaining in the lid or attached to the segments, yellowish, hyaline- 

 bordered, striate, densely articulate and trabeculate; basal membrane low, seg- 

 ments narrowly lance-subulate, as long as the teeth or shorter, sometimes two- 

 cleft, the divisions remaining attached to the teeth; cilia mostly rudimentary; 

 spores small to large; lid conic to rostrate. 



About 15 species, mainly on trees, in temperate regions; about 7 or 8 

 species in North America, probably four species in our region. 



Key to the Species 



A. Segments completely adherent to the teeth _ 1. P. intricata 



A. Segments free, at least in the upper third B 



B. Annulus 2-3-seriate, large-celled; spores about .017-. 024 mm 2. P. Selwynit 



B. Annulus uni-seriate;; spores .010-. 016 mm _-C 



C. Operculum rostrate; cilia none; spores .009-. 012 mm 3. subdenticulatu 



c. Operculum merely conic; cilia single, short or rudimentary; spores .012-. 016 mm 



4. P. polyantha 



1. Pylaisia intricata (Hedv/ig) Renauld and Cardot 



(P. velutina Bryologia Europaea; Pylainella velutina Kindberg, 

 Pterygynjndrum intricatum Hedwig) 



Plate XXXVII 



Similar in appearance to P. Selwynii with which it is often confused and 

 with which it grows, light-green, glossy, in closely entangled mats: branches 

 ascending or erect, when dry usually more or less hooked at the end; leaves 

 lanceolate, long-acuminate, usually falcate-secund, about 0.8-1.2 mm long, 

 about 0.2-0.3 mm wide; leaf-cells similar to those of P. Selwynii but with a 

 smaller group of incrassate, quadrate, obscure alar cells; median leaf-cells about 

 6-10:1, sub-vermicular, about .004-. 005 mm wide; costa none: seta straight, 

 smooth, about 4-5 mm long; capsule ovoid-cylindric, about 2 mm long, erect, 

 symmetric, castaneous; lid long-conic, about 0.5 mm long; peristome-teeth 

 closely trabeculate, dorsally distinctly lamellate and with divisural, finely cross- 

 striate; segments very delicate, split and adherent to the teeth throughout their 

 whole length, basal membrane indistinct or none; spores densely incrassate, 

 castaneous-pellucid, finely papillose, in our specimens about .018-. 030 mm in 

 diameter, mature in fall. 



On bases of trees or on stumps or logs, usually in mountainous or hilly 

 regions; Newfoundland to Ontario and Minnesota, south to North Carolina. 



Rare in our region. Butler Co.; On log m woods, Millingar School, Oakland Twp., 

 Dec. 2, 1934. Sidney K. Eastwood. McKean, Co.: Bennett Brook, October 23, 1897, 

 and Limestone Creek, near Bradford, October to December, 1896 (figured). The latter 

 mixed with Grout's No. 134. North American Musci Pleurocarpi. Washington Co.: 

 On bark of fallen tree, near Washington, Aug. 4, 1892. A. Lmn and J. S. Simonton. 



