Jennings: Manual of Mosses— 2. Dicranaceae 6^ 



5. Dicranum fulvum Hooker 



(D. interriiptum Bryologia Europaea) 

 Plate XIII 



Deeply bui 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 

 leat-width at base, usually somewhat excurrent, dorsally serrulate above, in 

 the long acumination occupying most of the leaf; median and upper leaf-cells 

 quadrate to shortly rectangular, strongly yellowish-incrassate, the lower rectan- 

 gular, not porose at base, becoming in the alar portion enlarged, inflated, 

 rectangular to quadrate, thin-walled, brownish, this alar area reaching usually 

 to the costa; perichaetial 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 rostrate and about 1.5 mm long; annulus rather narrow; exothecial 

 cells yellowish-incrassate, quadrate to rectangular or cblong-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 moun- 

 tains, often on the face of sandstone cliffs; Europe and North America from 

 Nova Scotia and North Carolina west to the Mississippi River. 



Rather common in our region. Now known from Butler, Fayette, Greene, McKean, 

 Warren, and Westmoreland counties. Figured from specimen collected from rock in 

 woods, Ohio Pyle. Sept. 1-3, 1906. O.E.J. & G.K.J. 



5a. Dicranum fulvum var. viride (Sull. 8c Lesq. Grout 



(D. viride Lindberg) 

 Plate XIII 



Densely cespitose, yellowish-green to dark green or sometimes 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 acumination often concave or canalicu- 

 late, the margin entire or slightly denticulate at apex; costa strong, percurrent 

 or excurrent, at base comprising from one-fourth to one-third the width of the 

 leaf; median and upper leaf-cells more or less regularly quadrate, small, in- 

 crassate, towards base slightly larger, but not much longer than broad, non- 

 porose, suddenly becoming enlarged, thin-walled, brownish, and rectangular up 

 to 3:1, the alar inflated and sometimes extending to the costa: capsule oblong, 

 erect or slightly curved. Not seen in fruit in our region. 



On decayed logs and on bases of trees in woods, rarely on rocks, in Europe, 

 Asia, and, in North America, from Newfoundland to the Rocky Mountains, 

 south to Pennsylvania and Ohio. 



