JtNNiNGS: Manual of Mosses — 29. Leskeaceae 197 



ovate, obtuse to abruptly apiculate to acuminate, spoon-shaped, marginally 

 plane to involute, serrate to dentate; costa mostly very short and delicate, 

 simple or forked; sometimes costa none; median leaf-cells small, incrassate, 

 elliptic, some rhomboid, at base short-rectangular to quadrate, smooth or 

 papillose by the thickening of the cell-angles, rarely dorsally mamillate; inner 

 perichaetial leaves red-brown, elongate-lanceolate, long-acuminate, plane-mar- 

 gined, serrate, ecostate, with linear cells: seta 10-20 mm long, thin, drying 

 twisted, red, smooth; capsule erect, somewhat inclined when empty, symmetric, 

 oblong-oval, short-necked, yellow-brown, finally constricted below the mouth; 

 annulus present; peristome-teeth basally confluent, lance subulate, yellow or 

 pale, bordered by the broader dorsal layer, lamellae numerous; inner peristome 

 finely papillose, hyaline to pale yellow, basal membrane yellow, carinate, seg- 

 ments lance-subulate, same length as teeth, cilia mostly shorter, filiform; lid 

 brightly colored, conic, acute to obtuse; calyptra fugaceous, small; spores small. 

 A genus of six species occurring in Europe, Asia, and in North America; 

 one species m our region. 



1. Myurella Careyana Sullivant 



(M. gracilis (Weinmann) Lindberg) 



Pale glaucous-green, loosely cespitose, interwoven with long radicles below: 

 stems slender, creeping to ascending, stoloniferous, fasciculately branching; the 

 branches julaceous; leaves loosely imbricate, open-erect, wide-ovate, narrowly 

 long-acuminate, spinulose-dentate all around, very shortly costate or ecostate; 

 leaf-cells large, pellucid, elliptic-rhomboid, dorsally with large papillae as in 

 Theha asprella: perichaetial leaves sheathing, lanceolate, filiform-acuminate, 

 dentate: capsules sub-erect, small, inflated, oval-oblong to obovate-oblong; seta 

 up to 1 cm long; peristome normally hypnoid, with articulate, yellowish, trans- 

 versely-striate teeth, entire segments and cilia two, somewhat shorter than 

 the teeth. 



Mainly in crevices and hollows in moist, shaded limestone rocks in hilly 

 or mountainous regions; Europe, Asia, and from Nova Scotia to northwestern 

 Canada, south to North Carolina and Tennessee. 



Rare in our region. Huntingdon Co.: Alexandria. T. C. Porter. (Porter's Cata- 

 logue) . 



3. Haplohymenium Dozy and Molkenboer 



Dioicous: slender, stiff, forming mats, dull, dark green to yellowish- or 

 brownish green : stems filiform, creeping, widely radiculose, here and there in 

 fascicles, more or less pinnately branched, branches spreading, short, obtuse; 

 paraphyllia none; lower leaves smaller, somewhat secund, abruptly lance-subu- 

 late and recurved-circinate from a broadly ovate base; costa very short or none; 

 upper leaves spreading to squarrose-spreading, imbricate when dry, from a 

 concave ovate base more or less abruptly lingulate, obtuse to short-acute, non- 

 plicate, margin plane and entire; costa delicate and reach ng to mid-leaf, or 

 stronger but not reaching apex; median leaf-cells turgid, thin-walled, rounded- 

 hexagonal, with mostly several papillae over the lumen, the marginal smaller, 

 transversely broader, in many rows towards the basal margin transversely 



