Jennings: Manual of Mosses — 7. Grimmiaceae 97 



median and upper cells rounded and .005-. 009 mm in diameter, all cells in- 

 crassate and more or less opaque: seta erect, stout, about 0.5 mm long; capsule 

 immersed, oval-oblong, about 1 mm long, reddish-brown, rather thick-walled, 

 smooth; calyptra short, lobed; operculum low-conic, rostrate; peristome single, 

 teeth 16, lance-linear, trabeculate, somewhat cribrose, reddish-brown, faintly 

 papillose, when dry reflexed-revolute; spores reddish-brown, in our specimens 

 about .012-. 018 mm in diameter; columella falling away with the operculum 

 and remaining attached to it; spores mature in late spring. 



On stones, hard earth, etc., with a wide distribution over the colder regions 

 of the earth. In America occurring from Alaska and Newfoundland to the 

 Northern States and south in the mountains to Georgia. 



G. apocarpa var. graciln (Schleicher) Weber and Mohr occurs on rocks 

 from lower Canada to West Virginia and Tennessee. It grows in loose, slender 

 mats up to 10 cm long; leaves lanceolate, acuminate, 1.5-2 mm long. 



Now known from the following counties: Butler. Erie, Fayette, Greene, McKean 

 (Porter), Washington (Porter), and Westmoreland. Specimen figured: Shaly bank of 

 stream. Shades Ravme, east of TrafFord, Westmoreland Co., March 25, 1910. O.E.J. 



2. Grimmia conferta Funck 



(G. apocarpa var. conferta (Funck) Sprengel) 



Densely cespitose, in gray-green rounded cushions: stems slender; leaves 

 1 mm or less long, keeled, margins revolute, lance-ovate to oblong, acuminate, 

 opaque, apex hyaline, denticulate; costa strong, dorsally prominent, ending at 

 apex; basal leaf-cells rectangular to quadrate, the upper smaller and rounded, 

 all incrassate and dense: seta short; capsule immersed, ovate-globose, wide- 

 mouthed, hemispheric and somewhat wrinkled when dry; peristome-teeth light 

 reddish-brown to orange, fragile, markedly cribrose; annulus said to be none; 

 lid wide, low-convex, apiculate; spores mature in spring. 



On rugged exposed rocks, Europe, Asia, and Africa, and, in North Amer- 

 ica, from Nova Scotia to British Columbia south to Idaho and North Carolina. 



Washington Co.: Linn and Simonton. (Porter's Catalogue). 



3. Grimmia pilifera Beauvois 



{^Grimmia pennsylyanica Schwaegrichen) 

 Plate LXIII 



Densely cespitose, dark green: stems 1 to 3 cm high, robust, rigid, branch- 

 ing; leaves close, narrowly ovate-lanceolate, acuminate, concave, the hyaline 

 point usually distinctly spinulose; margins somewhat recurved below and 

 thickened above; basal leaf-cells linear-rectangular 3-6:1, thin-walled, hyaline 

 to yellow-pellucid, shortly above base the cells incrassate-sinuous, short-r-rctan- 

 gular, the upper rounded-quadrate to hexagonal, small, piliferous: seta about 

 half as long as urn, capsule more or less completely immersed, oblong-ovate, 

 smooth, even when dry, lid conic-rostrate, about three-fifths as long as urn, 

 erect; annulus large; peristome-teeth large, broadly lanceolate, irregularly split 

 and cribrose to about the middle, castaneous pellucid; calyptra lobed, mitrate; 

 spores mature in the autumn but often not shed till spring: dioicous. 



