OF WESTERN PENNSYLVANIA 349 



Lawrence : In rivulet, bottom of Conoquennessing 



Gorge, near Rock Point, October 1^, 1910. 

 O. E. J. and G. K. J. 



McKean : On stones in running water. Boss Branch, 



October 20, 1893, Bolivar Run, August 

 25, 1895, Lewis' Run, November 24, 1895, 

 and Bennett Brook, November 2, 1896, 

 all near Bradford. D. A. B. 



Westmoreland: On submerged stones in Tub-Mill Run 

 and on gravelly bottom of mountain 

 spring, Slellon's estate, Rachelwood, 

 Laurel Hill Mountain, September 8-11, 

 1907. O. E. J. (Figured). 



2. Oxyrhynchium hians (Hedwig) New Combination. 



(Hypniiin hians Hedwig; Eitrynchhtin hians Jaeger and Sauer- 

 beck; Hypmim praelongum C. Mueller; Pterygynandrum 

 apiculatum Bridel). 



(Plate LHI) 



Rather slender, depressed, cespitose, somewhat shining: 

 stems creeping, rather sparsely branched, slender, usually not 

 over 3 or 4 cm. long, the branches short and more or less dis- 

 tichously arranged; leaves of the stem and longer branches 

 rather distant, on some of the short branches sometimes more 

 or less imbricated-julaceous, the stem-leaves about 1-1.6 mm. 

 long by three-fourths as wide, concave, ovate, the apex abrupt- 

 ly acute to shortly acuminate, the base clasping but not de- 

 current, margins sharply serrulate nearly to the base; branch- 

 leaves closely similar; costa distinct, reaching to one-half to 

 four-fifths the length of the leaf; median cells about 5-8:1, 

 prosenchymatous, medium-walled, the apical rhomboid, short- 

 er, about 2-A:\, the basal shorter and incrassate, the alar form- 

 ing an indistinct group of thick-walled quadrate to rectangular 

 cells ; perichsetial leaves up to 2 mm. long, ovate-oblong, sheath- 

 ing, acuminate, serrate above : seta dark-castaneous, stout, 

 strongly papillose, 1-1.5 cm. long; capsule inclined to hori- 

 zontal, arcuately oblong-cylindric, narrowed below the rim 

 but slightly when dry, the urn about 2 mm. long by 1 mm. 

 thick, castaneous; operculum conic and slenderly rostrate, 

 yellowish, about 1 mm. long; exothecial cells yellowish-incras- 

 sate, at the rim rounded-quadrate in about two series, below 

 larger oblong-rectangular ; annulus narrow, 2-seriate ; peris- 

 tome-teeth castaneous, slender, hyaline-papillose at apex, 

 strongly trabeculate, narrowly margined, the dorsal lamellae 

 often in three series towards the base, striolate in various di- 

 rections; segments about as long as teeth, slender, narrowly 

 carinately gaping between nodes, the basal membrane about 



