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- 

 clate 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 ; perichaetial 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. T. 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, Tune 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. Tulv 13. 1908. O. E. T. 



