Jennings: Manual op Mosses — 2. Dicranaceae 55 



1. DiCRANELLA FiTZGERALDi Renauld and Cardot 



(D. heteTomalla var. orthocarpa (Hedwig) Pans) 

 Plate X 



Rather densely cespitose, yellowish-green: stem 5-10 mm long, mostly 

 simple, erect, leaves crowded, erect-spreading, sometimes subsecund, about 

 3-3.5 mm. long, up to 0.5 mm broad at base, from the lance-ovate base narrow- 

 ing above into a long, canaliculate-subulate, denticulate apex; costa at base 

 rather indistinct, about one fourth to one-third the width of the leaf, strong 

 above and constituting most of the acumination; basal leaf-cells elongate- 

 rectangular or sub-rectangular, reaching 8x55 microns, hyaline, a few in the 

 extreme alar portion often quadrate, median cells quadrate: seta erect, yellow- 

 ish-red, becoming quite dark brownish-red when old, about 7-8 mm long, 

 when dry sinistrorse in the lower half and dextrorse above; capsule erect, sym- 

 metric, about .6-. 9 x .25-. 3 mm, oblong, not constricted below mouth, smooth 

 or nearly so even when dry and empty, when ripe brown; peristome single, the 

 teeth very slightly united below, cleft about half-way into linear-subulate 

 prongs, sometimes sub-cribrose along the divisural, articulate, longitudinally 

 striolate-granulose, towards apex hyaline; spores minutely papillose, about 

 .014-. 017 mm, mature in late fall or winter; operculum low-conic with an 

 oblique rostrum. 



On soil, soil-covered rocks, etc., in the eastern and southeastern parts of 

 the United States. 



Allegheny Co.: Schenley Park, Pittsburgh, August 16, 1905, McKees Rocks, 

 August 27, 1905, and Fern Hollow, Pittsburgh, March 8, 1908 (figured). O.E.J.; Wild- 

 wood Road, March 29, 1908. O.E.J, and G.K.J. Armstrong'^Co.: On clay bank, 

 Logansport. C.M.B. Feb. 22, 1943. Butler Co.: Frazier's Mill Jefferson Twp., on 

 ground. S. K. Eastwood. Fayette Co.: Ohio Pyle "Peninsula." C.M.B. Oct. 13, 1935. 

 Indiana Co.: Clay roadside ditch, near Crete. O.E.J. &C G.K.J. Nov. 2, 1941. 



2. DiCRANELLA HETEROMALLA [Dillenius] Schimper 



{Dicranum heteTomallum Hedvvig) 

 Plate XI 

 Cespitose, bright yellowish to dark green; stem erect or ascending, 0.5-3.0 

 cm tall: leaves numerous, lance-subulate, concave, 2-3 mm long, denticulate 

 towards the apex, usually also denticulate dorsally towards the apex; costa 

 strong, one-fifth to one-third the width of the leaf at base, percurrent, bordered 

 towards the apex by a narrow margin of lamina; leaf-cells parenchymatous, at 

 leaf -base 2-5 times as long as wide, rectangular, brownish, narrower towards 

 the margin, the upper cells shorter and often obliquely quadrilateral; seta 

 1.5-2.5 cm long, greenish-yellow, dextrorse; capsule smooth, about 1.5 mm long, 

 oblong, castaneous to dark brown, more or less erect, usually slightly curved, 

 when dry bent and curved in at the upper part just below the rim on one side 

 in a very characteristic manner, furrowed; operculum hemispheric, with a linear 

 obliquely inclined beak about 1 mm long; peristome-teeth red, bifid to below 

 the middle or about to the middle, sometimes trifid, with somewhat projecting 

 trabecula?, articulate, minutely papillose-striate, hyaline and papillose at apex; 

 exothecial cells incrassate, irregularly elongate-rectangular to oblong-hexagonal. 



