OF WESTERN PENNSYLVANIA 239 



1. Thelia hirtella (Hedwig) Sullivant. 



(Pterigynandnmi hirtelluiu Hedwig; Hypnum hirtellum C. 

 Mueller). 



(Plate XXXIV) 



Light green to glaucous-green, small, forming thin and 

 loosely adherent mats : primary stems creeping, felted with a 

 reddish-brown tomentum, pinnate with numerous short, 

 crowded, julaceous secondary stems and branches; leaves sub- 

 orbicular, deeply concave, abruptly and narrowly acuminate, 

 decurrent at base, dorsally papillose, the margins plane, spinu- 

 lose-dentate above, at least in the upper half, fimbriate-ciliate 

 below with usually upturned cilia ; costa slender, reaching 

 about to the leaf-middle ; median leaf-cells pellucid, rhomboid- 

 elliptic, with long, slender, simple dorsal papillae; apical leaf- 

 cells linear, the basal larger and looser, the alar quadrate to 

 rectangular, almost smooth, rather incrassate; perichsetial leaves 

 numerous, the inner lance-oblong, narrowly acuminate, ciliate- 

 fimbriate in the upper part: seta about 1 cm. long; capsule 

 narrowly oblong-cylindric, about 2.5x0-5 mm., erect, sym- 

 metric, thin-walled; peristome-teeth linear, distinctly lamel- 

 late, the inner basal membrane truncate and about one-third as 

 high as the teeth, peristome whitish; spores pale yellow, ma- 

 ture in fall, thin-walled, about .012-.015 mm., smooth. 



On trunks and roots of trees and on stumps, in woods; 

 from New England and Ontario to Kansas and the Gulf States. 

 Not often collected in our region. 



McKean : On trees, near the ground. Gates Hollow, 



Bradford, April 18, 1897. D. A. B. (Fig- 

 ured). 



Westmoreland: T. P. James. (Porter's Catalogue). 



2. Thelia asprella Sullivant. 

 (Leskea asprella Bryologia Europsea). 

 (Plate XXXIV) 

 In most respects quite similar to T. hirtella, but more glau- 

 cous-green; densely interwoven into mats up to 1.5 mm. thick; 

 leaves bordered nearly all around by somewhat longer cilia, 

 and the papillae on the dorsal surface of the leaf more or less 

 branched or stellate: peristome-teeth longer with nodose ar- 

 ticulations ; spores mature in early fall. 



In the same habitat as the last species and often mixed 

 with it ; ranging from New England to Ontario and Minnesota 

 and south to the Gulf States. Evidently not common in our 

 region. 



Erie : In oak woods, Presque Isle, May 8-9, 



1906. O. E. J. (Figured). 

 McKean : D. A. B. (Porter's Catalogue). 



