WESTERN PENNSYLVANIA 71 



5. Dicranum fulvum Hooker. 

 (P. intcrniptitm Bryologia Europsea. 



(Plate IX) 



Deeply but rather loosely cespitose, fulvous to brownish- 

 green : stem ascending to erect, sparsely branching, radiculose 

 at base ; leaves numerous, secund, somewhat crisped when dry, 

 about 5-6 mm. long, gradually narrowed, from a concave 

 lanceolate base to a linear-acuminate more or less concave to 

 canaliculate apex, the upper margin serrulate ; costa strong, 

 about one-third of leaf-width at base, usually somewhat ex- 

 current, dorsally serrulate above, in the long acumination oc- 

 cupying most of the leaf; median and upper leaf-cells quadrate 

 to shortly rectangular, strongly yellowish-incrassate, the lower 

 rectangular, not porose at base, becoming in the alar portion 

 enlarged, inflated, rectangular to quadrate, thin-walled, brown- 

 ish, this alar area reaching usually to the costa ; perichsetial 

 leaves linear-subulate from a broadly sheathing base: seta 

 single, rather stout, erect, flexuous, yellowish to dark with age, 

 about 1-1.5 cm. long; capsule erect, symmetric to slightly 

 curved, the urn about 4 mm. long, cylindric, castaneous, sulcate 

 when dry and empty; lid stoutly and more or less obliquely 

 lostrate and about 1.5 mm. long; annulus rather narrow; 

 exothecial cells yellowish-incrassate, quadrate to rectangular 

 or oblong-hexagonal, several rows below the mouth much 

 smaller and rounded-quadrate-hexagonal ; spores large, .024- 

 .030 mm., smoothish, rather thin-walled, mature in autumn. 



Generally on non-calcareous rocks in moist woods among 

 the hills or mountains. Europe and North America from Xova 

 Scotia and Xorth Carolina west to the Mississippi River. 

 Rather uncommon in our region. 



Fayette : On rocks in woods, Ohio Pyle, September 1-3, 

 1906. O. E. J. and G. K. J. (Figured). 



McKean : Toad Hollow, June 9, 1896, Bolivar, August 6, 

 1897, Quintuple, April 11, 1898, and Rutherford. 

 September 16, 1898, all near Bradford. D. A. B. 



6. Dicranum viride (Suilivant) Lindberg. 



(Plate IX) 



Densely cespitose, yellowish-green to dark green or some- 

 times almost blackish : stems ascending, up to 2 cm. high, 

 simple or sparsely branching, radiculose below ; leaves 3-4 

 mm. long, spreading or recurved, when dry crisped, the apices 

 usually found broken off, the leaves close, gradually linear- 

 acuminate from a lanceolate base, concave below, the acumi- 

 nation often concave or canaliculate, the margin entire or 

 slightly denticulate at apex; costa strong, percurrent or ex- 

 current, at base comprising from one-fourth to one-third the 



