250 A MANUAL OF MOSSES 



sub-percurrent ; branch-leaves hardly different but scarcely 

 plicate; median leaf-cells usually uni-papillate on dorsal sur- 

 face, smooth on ventral, quadrate-hexagonal, about .008-.010 

 mm., the apical more rounded, the basal somewhat quadrate; 

 capsule erect, basally tapering, oblong-cylindric ; peristome- 

 teeth whitish, lance-linear, lamellate, about 0.4 mm. long, the 

 linear segments shorter, carinate, sometimes more or less 

 rudimentary, cilia none ; lid conic, acute to obtuse ; spores ma- 

 ture in summer. 



On the bases of trees, roots, and on rotten logs, etc. ; from 

 eastern lower Canada to the Gulf States and westward to the 

 Rocky Mountains. Only once reported in our region. 



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



3. Leskea obscura Hedwig. 



(L. nervosa Sullivant; L. microcarpa Schimper). 



(Plate XXXV) 



Small, loosely and intricately cespitose, dark green : stems 

 prostrate, rather irregularly divided, sparingly branched ; leaves 

 incurved-appressed when dry, spreading when moist, about 

 0.8-1.2 mm. long, from an ovate base narrowed above to a 

 rather blunt apex, concave, recurved on the margin, entire 

 or serrulate ; casta ending a little below the apex ; median leaf- 

 cells quadrate-hexagonal, about .008-.010 mm. wide, with sev- 

 eral small papillae on the lower svirface, on the upper surface 

 less papillose or almost smooth, apical and basal cells some- 

 what wider and shorter, the alar oblong-quadrate; branch- 

 leaves similar; perichsetial leaves long-sheathing, rather laxly- 

 celled, costate: seta about 1.5-2 cm. long; capsule erect, 

 straight, short-cylindric, sometimes slightly curved, more or 

 less wrinkled and contracted below the mouth when dry; lid 

 conic, rather obtuse; peristome-teeth yellowish, papillose, the 

 segments linear, slender, carinately cleft between the articula- 

 tions, shorter than the teeth, arising from a basal membrane 

 about one-fifth the length of the teeth ; spores mature in early 

 summer. 



On stones, roots of trees, logs, etc., often where sometimes 

 overflowed; Japan, and from New Brunswick to Ontario and 

 southwards through the eastern and central part of the United 

 States. Probably fairly common in our region. 



Allegheny : On bark of white oak at three feet from 

 ground, Fern Hollow, Pittsburgh, March 

 8, 1908, and at base of trees in swampy 

 woods near Douthett, December 29, 1908. 

 O. E. J. (Figured). 

 Blair : Tyrone. T. P. James. (Porter's Cata- 



logue). 



