Jennings: Manual of Mosses — 2. Dicranaceae 61 



2. DicraNUM scoparium [Linnaeus] Hedwig 

 {Bryum scoparium Linnaeus) 



Plate XII 



Large, rather loosely tufted, glossy, yellowish-green, often brownish below: 

 stems growing upwards and dying away below, often 7 or 8 cm long, densely 

 felted-radiculose; leaves falcate-secund, often more or less tufted at the upper 

 end of the innovations, about 8-12 mm long, linear-subulate, not undulate, 

 concave, serrate towards apex, little changed when dry; costa strong, flat, one- 

 fourth to one-third the width of the leaf at base, above bearing four serrate 

 dorsal lamellae; leaf-cells at base enlarged, quadrate to rectangular, rather 

 thin-walled, orange-colored, the median elongate rectangular to somewhat linear, 

 incrassate, porose, the apical irregularly oblong, not porose: seta about 3 cm 

 long, erect-sinuose, yellowish to chestnut-brown, lighter below, usually sinis- 

 trorse, sometimes dextrose above; capsule 3.5-4 mm long, about 0.8 mm thick, 

 chestnut-brown, cylindric, arcuate, when dry furrowed and slightly constricted 

 below the mouth, tapering below into a short neck, exannulate; operculum 

 low-conic, subulate-rostrate the beak about 2.5 mm long; calyptra about 6-7 

 mm long, cucullate, conic-rostrate, peristome single; teeth pellucid, reddish- 

 brown, papillose above, below strongly articulate and vertically striate, divided 

 about one-half into 2 or 3 lance-subulate prongs, sometimes more or less crib- 

 rose; spores globose, slightly roughened, about .020-. 024 mm, mature in late 

 summer or early fall. 



On soil, logs, rocks, etc., in woods. Europe, Asia, and, in North America, 

 throughout the cooler and temperate regions. 



Quite common in our region. Known from Allegheny, Armstrong. Beaver, Bedford, 

 Butler, Cambria, Cameron, Centre, Clinton Erie, Fayette, Forest, Greene. Huntingdon, 

 McKean, Somerset, Venango, Warren, Washington, and Westmoreland counties. Speci- 

 men figured: Ohio Pyle, Fayette Co., Sept. 1-3, 1907. O.E.J. 6C G.K.J. 



2a. Dicranum Bonjeani DeNot. 



A specimen collected by C. M. Boardman on a talus slide one-half mile 

 north of Sulphur Springs, Bedford Co., Pa., approaches D. scoparium very 

 closely. 



3. Dicranum montanum Hedwig 



Plate XII 

 Densely cespitose, bluish to 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- 

 lanceolate, up to 5 mm long, concave below and canaliculate above to near the 

 apex, on margin and back of costa serrulate above; costa rather strong, percur- 

 rent or almost excurrent, forming about one-fourth to one-fifth of the width 

 of the leaf at base; median leaf-cells shortly rectangular-quadrate to laterally 

 oblong, incrassate, yellov/ish, the upper somewhat smaller and rounded-quad- 

 rate, 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 often 



