OF WESTERN PENNSYLVANIA 147 



pellucid, rather tliin-walled, 2-3 rows at mouth much smaller 

 and darker : dioicous ; antheridial flower terminal, discoid, the 

 perigonial bracts wide-spreading : mature in our region in May. 



Almost a cosmopolitan in ditches, springs, or wet clay 

 banks, etc. Rarely fruiting but rather common sterile. 



Allegheny : Tern Hollow and Schenley Park, August, 



1905. O. E. J. 



Beaver : Near Beaver Falls, May 14, 1907. O. E. J. 



McKean : Springy places. Quintuple, May 17, 1895. 



D. A. B. (Figured). 



Westmoreland : Wet soil in niches of cliff, Saunders Sta- 

 tion, June 21, 1907. O. E. J. and G. K. J. 



4. BRY U M [Dilleniusl Schimper. 



Mostly synoicous: paraphyses present, filiform: perennial, 

 small, robust, rarely gregarious, usually more or less densely 

 cespitose: stem upright to ascending, often red, branching be- 

 low the inflorescence, radiculose ; lower leaves remote, upper 

 leaves tufted, mostly erect-spreading, concave, oval or ovate 

 to lanceolate, or elliptic to spatulate, mostly acute, often nar- 

 rowed and decurrent at base, mostly bordered, entire or 

 toothed towards the apex ; costa mostly strong, often excur- 

 rent, projecting dorsally, provided with median guides; leaf- 

 cells mostly rhombic- to rhomboid-hexagonal, the basal 

 parenchymatous, quadrate to elongate-rectangular ; perichsetial 

 leaves narrower and smaller inside: seta long, reddish to 

 brown, hooked or arcuate at apex, capsule cernuous to pendent, 

 rarely horizontal, the coUum distinct, pyriform to cylindric, 

 rarely ovoid to globose, symmetric to slightly curved, the 

 curve sometimes being entirely in the coUum, phaneropore, 

 annulus present, large-celled, pluriseriate, revoluble ; the two 

 peristomes of nearly equal length, teeth confluent at their in- 

 sertion, lanceolate to linear-subulate, often abruptly narrowed 

 above the middle, yellowish to orange, often hyaline at apex 

 and sometimes with a hyaline border, dorsally minutely papil- 

 lose, trabeculse sometimes united by cross-partitions ; seg- 

 ments mostly free, basal membrane usually high, outwardly 

 carinate, segments narrowly linear to lanceolate-subulate, split 

 along the keel and more or less fenestrate or gaping, rarely 

 entire; cilia filiform, rarely short or lacking, often appendicu- 

 late; spores .010-.050 mm.; operculum conic to convex-um- 

 bonate or rarely quite apiculate. 



A large and difficult genus of about 850 species, of wide 

 distribution; about 170 species in North America, of which 

 there are 8 or 9 species in our range. 



