OF WESTERN PENNSYLVANIA 69 



Fayette : Ohio Pyle, September 1-3, 1906, and Sep- 



tember 1-3, 1907. (Figured). O. E. J. and 

 G. K. J. 



Huntingdon : Tussey's Mt., near Bailevville, July 13, 



1909. " O. E. J. 



McKean : Toad Hollow, Bradford, October 18, 1894, 



Rutherford Rocks, Bradford, June 19, 

 1896. and Langmade, November 3, 1895. 

 D. A. B. 



3. Dicranum montanum Hedwig. 

 (Plate VIII) 



Densely cespitose, light yellowish-green, lustrous: stems 

 erect, short, up to 1 cm. in our region, sparsely branching; 

 leaves much crisped when dry, in the same cushion some of 

 the plants with equally-spreading leaves, others with all secund 

 leaves, from a wider base gradually narrowly linear-lanceo- 

 late, up to 5 mm. long, concave below and canaliculate above 

 to near the apex, on margin and back of costa strongly ser- 

 rulate above ; costa rather strong, percurrent or almost excur- 

 rent, forming about one-fifth of the width of the leaf at base; 

 median leaf-cells shortly rectangular-quadrate to laterally ob- 

 long, incrassate, yellowish, the upper somewhat smaller and 

 rounded-quadrate, more or less distinctly papillose, the basal 

 rectangular, thinner-walled, up to 6:1, the alar not much 

 larger but quadrate-inflated, all the basal cells more or less 

 castaneous in color; perichaetial leaves similar to stem leaves; 

 seta single, erect, yellowish to brownish, about 1.5 cm. high; 

 capsule oblong-cylindric, slightly curved, yellowish to finally 

 brownish, plicate when dry and empty, the urn about 2.5 mm. 

 long; the lid conic, more or less obliquely rostrate, about 1.5 

 mm. long, castaneous ; annulus narrow; peristome-teeth cleft to 

 below the middle or nearly to the base into linear-subulate, 

 deeply castaneous, articulate, faintly trabeculate,. striate- 

 papillose divisions ; exothecial cells yellowish-incrassate. ir- 

 regularly oblong to rectangular, the upper 3-6 rows much 

 -mailer, more deeply colored and incrassate, rounded-quadrate 

 or hexagonal; spores smoothish, yellowish, about .022- .025 

 mm., not very thick-walled, maturing in early fall. 



On rotten wood and on roots and trunks of trees. Europe, 

 Asia, and, in North America, from Newfoundland to the north- 

 ern United States and westward to the Rocky Mountains. 

 Rather rare in our region. 



Elk : McMinn. (Porter's Catalogue). 



Huntingdon: Porter. (Porter's Catalogue). 

 Fayette : Ohio Pyle, on rotten log, September 1-3. 1906. 

 O. E. j. and G. K. J. *~ (Figured). 



