192 A MANUAL OK MOSSES 



about .008-.011 mm.; calyptra about .5-6 mm. long, narrowly 

 cucullate, extending to about the middle of capsule, spinulose- 

 hairy on apex; operculum hemispheric-conic, shining reddish- 

 brown, terminating in a linear-subulate oblique beak about 

 2 mm. long. Known only as follows: 



Allegheny : Powers Run, September 21, 1905, May 



30-31, 1908. O. E. J. 

 Fayette : On shaded woodland bank, Ohio Pyle. O. 



E. J. and G. E. K., September 10, 1905. 

 (Figured). Type. (Deposited in Penn- 

 sylvania Herbarium of the Carnegie 

 Museum. 

 Westmoreland: Miss K. R. Holmes, 1902. 



2. POGONATUM Beauvois. 



Dioicous : gregarious to weakly cespitose : fertile stems 

 arising from a creeping underground stem or from a radicu- 

 lose protonema, erect, stiff, short and simple or some longer 

 and branched; leaves gradually longer upwards, erect-spread- 

 ing to recprved, more or less clasping at base, stiffened by 

 mostly numerous lamellae, especially towards the apex, the 

 margins more or less distinctly spinulose, leaf-blade smooth 

 dorsally, usually for the most part bi-stratose ; the lower part 

 of costa narrow and plane, dorsally towards the apex toothed ; 

 cells of the leaf-blade small, incrassate, in the unistratose 

 border mostly quadrate or transversely elongate, basal cells 

 elongate to linear, yellowish to hyaline, thinner walled: seta 

 solitary, sometimes more, castaneous; capsule erect, straight 

 or curved, cylindrical, without stomata; peristome-teeth 32, 

 pale to yellowish-brown with a darker axis ; operculum con- 

 vex and more or less long-rostrate; calyptra mitrate, densely 

 hirsute, more or less shaggy. 



A large genus of about 165 species, growing on earth, 

 widely distributed; about 45 species in North America; only 

 one species yet found in our region. 



Key to the Species. 



a. Robust, S-IS cm. high, branching; marginal cells of laraells papil- 

 lose, b. 

 a. Mostly short, simple; marginal cells of lamellae elliptic and smooth. 



c. 

 • b. Leaf-margins entire. (,P.brachyphyllum[^\cfa- 



ard] Schwaegrichen). 

 b. Leaf-margins more or less serrate. 1. P. pennsylvanicum. 

 c. Exterior cells of lamellae round in cross-section: capsule rnore or 

 less papillose. (P. Mmig^fj^m [Linnaeus] 



Beauvois). 

 c. Exterior cells of lamella: ovate in cross-section: capsule not papil- 

 lose. {P norvegkum [Hedr 



wig] Beauvois) . 



