OF WESTERN PEXXSYLVAXIA 251 



McKean : Tuna Creek, Bradford, December 21, 



1895. D. A. B. 

 Washington : Linn and Simonton. ( Porter's Catalogue). 



7. LESKEELLA (Limpricht) Loeske. 



Dioicous : slender, in flattened, wide-spreading mats, dark 

 green to brownish, dull ; stem widely creeping, fasciculately 

 yellowish-red-radiculose, densely-leaved, numerously-branched, 

 with erect and short branches ; leaves drying imbricate, when 

 moist erect-spreading to secund, more or less abruptly long- 

 acuminate from a decurrent, doubly-plicate, cordate base, mar- 

 gins narrowly revolute below but plane in the acumen, entire; 

 costa strong, yellow-brown, ending in the acumen ; cells 

 rounded-hexagonal, in leaf-middle oval and oblong, in middle 

 of base rectangular, the alar quadrate; branch-leaves smaller 

 with plane margins and delicate and shorter costa ; perichsetial 

 leaves pale, from the erect and half-sheathing base abruptly 

 long-acuminate, delicately costate to the acumen: seta elon- 

 gate, stiff, dark chestnut-color, smooth ; capsule erect, sym- 

 metric, cylindric or oblong, rarely weakly curved, finally rust- 

 colored to brown ; annulus rather persistent, deciduous in sec- 

 tions ; peristome-teeth erect when dry, confluent at base, subu- 

 late, bordered, yellowish, cross- and obliquely-striate, smooth 

 or papillose above, not distinctly trabeculate ; inner peristome 

 yellow, finely papillose, basal membrane moderately promi- 

 nent, segments irregular, in nodose projections, filiform, etc., 

 sometimes carinate, cilia mostly none ; lid convex, obliquely 

 thick-rostrate ; calyptra glabrous, c-ucullate and reaching to 

 base of capsule ; spores small. 



A small genus of 5 species; only the following in Xorth 

 America : 



1. Leskeella nervosa [B ridel] Loeske. 



(Lcskca ncri'osa Myrin ; Lescnraea rigidula Kindberg; Hypnnin 

 nervosnm C. Mueller J. 



(Plate XXXV) 



Slender, in thin and appressed tufts, dark green to brown- 

 ish, the older parts almost black : stems creeping, up to 5 or 6 

 cm. long, pinnately divided and again branched into numer- 

 ous, crowded, short and erect or longer and creeping branches, 

 often with numerous gemmiform branches towards the apex ; 

 stem-leaves close, broadly ovate, sub-cordate, open-spreading 

 when moist, imbricate when dry, slightly decurrent, about 

 0.4-0.5x1-1-2 mm., suddenly long- acuminate, the acumen re- 

 curved, the margins plane, sub-sinuate, the blade concave and 

 deeply plicate; costa almost percurrent, slender; branch-leaves 

 considerably narrower, lanceolate, more rigidly erect-spread- 

 ing, smaller, up to about 0.6-0.7 mm. long; leaf-cells oblong to 



