OF WESTERN PENNSYLVANIA 177 



median cells strongly papillose on upper end, about .003-.006X 

 .015-.030 mm., elongate-rectangular, apical cells narrower and 

 tending to vermicular-hexagonal, basal cells looser, more or 

 less rectangular, up to .012X-040-.060 mm., smooth; inner 

 perichaetial leaves ovate-triangular at base with the costa ex- 

 current into a subulate apex, the margin entire, the cells rather 

 lax ; perigonial leaves erect-spreading, long-acuminate : seta 

 about 2.5-3 cm. long, erect, smooth, shining, reddish-brown, 

 when dry flexuous ; capsule globose to ovoid-globose, faintly 

 striate, about 2-2.5 mm. in diameter, brownish, when dry 

 sulcate and variously wrinkled, arcuate, cernuous, the neck 

 sunken in, about 4-6 rows of cells at the mouth of the capsule 

 laterally elongate ; peristome double, the teeth 16, narrowly 

 triangular-lanceolate, prominently articulate, pellucid, orange 

 to reddish-brown, divisural zigzag, distinct below ; segments 

 narrow, about four-fifths as high as the teeth, mostly split 

 apart; cilia three, very short, the basal membrane comprising 

 more than half the height of the inner peristome, the seg- 

 ments and the upper part of the membrane orange-pellucid, 

 papillose-striate ; spores globose, papillose, pellucid, orange to 

 reddish-brown, .018-.020 mm., mature in June. 



On dripping rocks along streams, wet places, etc., from 

 Massachusetts to Pennsylvania and westward to Kansas and 

 Washington. Uncommon in our region. 



Allegheny : In crevices of rocky bed of stream, ravine 



of Power's Run, May 14, 1908. O. E. J. 

 (Figured). 



Lawrence : Wet rocks in deep ravine near Rock 



Point, June 26, 1909. O. E. J. 



2. Philonotis calcarea (Bryologia Europaea) Schimper. 



(Plate XXV) 



Densely and softly cespitose, bright green, more or less 

 glaucous above, brownish below: stems long, up to 10-12 cm., 

 slender, erect in the dense tufts, red-brown and densely felted- 

 tomentose below ; branches in whorls ; leaves dimorphic, stem- 

 leaves broadly ovate, acuminate, about 1.5 mm. long by 1 mm. 

 wide, deeply concave, plicate, towards the apex sharply serru- 

 late, towards the base the basal papillae of the cells forming 

 rounded projections, especially on the revolute margins, the 

 margins revolute narrowly towards the clasping and sub-de- 

 current base, the leaves erect-spreading to secund when moist, 

 shrunken and sub-crispate when dry ; branch-leaves when 

 moist usually more or less falcate-secund, lanceolate and nar- 

 rowly acuminate, about 1-1.5 mm. long, by 0.5 mm. wide, when 

 dry somewhat shrunken and twisted ; costa in both forms of 

 leaves strong, ending in apex, dorsally papillose, basal leaf- 



