OF WESTERN PENNSYLVANIA 195 



1. Polytrichum ohioense Renauld and Cardot. 

 (Plate XXVIII) 



Erect, loosely cespitose, about 2.5-7 cm. high (gameto- 

 phyte), olive-green: stems wiry, slightly or not at all tomen- 

 tose below, chestnut-brown ; leaves widely spreading when 

 moist, erect-appressed when dry, or with the tips flexuous- 

 spreading, lower leaves small and linear, the upper about 8-12 

 mm. long, the linear-lanceolate limb spreading from an ob- 

 long sheathing base about 2-3 mm. long, the limb serrate and 

 ending in a spinulose, stiff, pellucid acumen, very strongly 

 costate, the costa with about 40-50 lamellae; lamellae 4—6 cells 

 high, the terminal cell wider but not longer and not bi-cuspi- 

 date or retuse; cells in alar portion of sheathing base of leaf 

 elongate-rectangular, about .010-.015X-100-.130 mm., prosen- 

 chymatous or parenchymatous, in middle of sheathing" base 

 narrower and proportionally longer, somewhat incrassate, in 

 limb rounded, incrassate and pellucid-opaque; perichcetial bracts 

 similar but with a longer more hyaline sheathing base and a 

 narrower limb : seta 4—8 cm. long, wiry, flexuous, lustrous, 

 chestnut-brown shading to golden above, erect; capsule erect 

 soon becoming more or less horizontal, acutely 4- (5) angled, 

 narrowed towards the base, about 2-3 by 4-6 mm., yellowish- 

 brown, hypophysis small but distinct; peristome-teeth pale 

 yellow with a darker median portion, about 0.2-0.25 mm. long ; 

 spores round, smooth, .015-.017 mm., mature in midsummer; 

 cells of exothecium about .007-.010 by .010-015 mm., quadrate 

 to hexagonal, incrassate, non-porose; operculum with a ros- 

 trum about equal in length to the diameter of the capsule; 

 calyptra yellowish, exceeding the capsule. 



On earth in moist woods, Alaska to Labrador, south to 

 Missouri and Alabama, also in northern Europe. 



Allegheny : Stoop's Ferry, October 7, 1905, Stewart's 



Stop, Charleroi Electric R. R. , August 



19, 1907. Wildwood Road, March 29, 



1908. O. E. J. and G. K. J. ; Power's Run, 



September 14, 1906. O. E. J. and G. E. 



K.; Carnot, May 25, 1902, December 5, 



1888. and Laschell Hollow, June 15, 1902. 



J. A. S.; Power's Run, July 31, 1904, 



Stoop's Ferry, June 4, 1906, Schenley 



Park, Pittsburgh, July 10, 1905. O. E. J. 



Armstrong : Kittanning, August 22, 1903. D. R. S.; 



Kittanning, October 12, 1905, August 16, 



1906. O. E. J. 



Cambria : : St. Lawrence, July 24, 1908. O. E. J. 



Clearfield : Clearfield, July 13, 1908. O. E. J. 



