230 A MAXL'AL O i 7 MOSSES 



Key to the Species. 



a. Segments completely adherent to the teeth. 



1. P. intricate. 

 a. Segments free, at least in the upper third. 



b. 

 b. Annulus 2-3-seriate, large-celled: spores about .017-.024 mm. 



2. P. schimperi. 

 b. Annulus uni-seriate; spores .010-.016 mm. 



c. 

 c. Operculum rostrate; cilia none; spores .009 .012 mm. 



3. P. subdenticulata. 



c. Operculum merely conic; cilia single, short or rudimentary; spores 

 .012-.016 mm. 4. P. polyantha. 



1. Pylaisia intricata (Heel wig) Renauld and Cardot. 



(P. velutina Bryologia Europ^ea ; Pylaisiella rehitina Kindberg; 

 Pterygynandrum intricatum Hedwig). 



(Plate XXXIII) 



Similar in appearance to P. schimperi, with which it often is 

 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. schimperi 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 lamel- 

 late 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 in- 

 crassate, castaneous-pellucid, finely papillose, in our speci- 

 mens about .018-.030 mm. in diameter, mature in late fall. 



On bases of trees or on stumps, usually in mountainous 

 or hilly regions ; Newfoundland to Ontario, south to North 

 Carolina. Rare in our region. 



McKean : Bennett Brook, October 23, 1897, and 



Limestone Creek, near Bradford, October 

 to December, 1896. (Figured). The lat- 

 ter mixed with Grout's No. 134. North 

 American Musci Pleurocarpi. 



2. Fylaisia schimperi Cardot. 



(P. intricata Bryologia Europsea; Pylaisiella intricata Grout). 



(Plate XXXIII) 



In thin, densely interwoven mats, dark-green, glossy; 

 rather closely and regularly pinnate : branches more or less 

 ascendinsr to erect, usually about 3-4 mm. long, when dry de- 



d? mi ^J * t 



