OF WESTERN PENNSYLVANIA 245 



crisped when dry, sub-falcate, secund, lance-ovate, frequently 

 serrulate at the apex, apex bluntly acute; costa strong, pel- 

 lucid, ending a little below the apex ; median, upper, and lower 

 marginal leaf-cells opaque, minute, rounded-quadrate, the 

 median basal somewhat elongated, cells minutely papillose; 

 perichsetial leaves long, linear-acuminate from an ovate base: 

 seta twisted when dry, erect ; capsule oblong-cylindric, sym- 

 metric or slightly curved, about 3:1 ; lid narrowly conic; peris- 

 tome-teeth lance-linear, more or less irregular, yellowish, the 

 inner peristome consisting of a very low basal membrane and 

 very short, irregular segments ; annulus double ; spores mature 

 in winter or early spring. 



Mostly on shaded rocks, sometimes on trees ; Europe, 

 Algeria, Asia, and in lower Canada and the northern United 

 States. Occurs in Pennsylvania at least as far west as Franklin 

 County, and is to be looked for in our region also. 



4. Anomodon attenuatus [Schreber] Huebener. 



{Leskea attenuata Hedwig; Hypnuin attenuatuin Schreber). 



(Plate XXXIV) 



Slender, loosely and widely tufted, with the secondary 

 stems fasciculately branched and with numerous slender 

 flagelliform branches ; leaves spreading to secund, concave, 

 usually more or less distinctly homomallous when dry, about 

 0.8-1.2 mm. long, broadly lanceolate from an ovate base which 

 is plainly narrowed to the insertion, the insertion somewhat 

 excavate and decurrent, the apex acute and minutely apiculate 

 and often with a very few teeth near the apiculation, the 'leaf- 

 margins plane below, and usually minutely crenulate by 

 reason of the projecting papillae; costa strong, ending a little 

 below the apex; areolation densely papillose on both sides, 

 irregularly hexagonal to quadrate, opaque, rather thin-walled, 

 a few of the median basal elongate-rectangular to oblong, 

 pellucid ; perichaetial leaves lance-acuminate from an ovate base : 

 seta about 2 cm. long, twisted ; capsule long, cylindric, straight 

 or slightly curved, lustrous, castaneous ; lid long-rostrate ; teeth 

 of peristome narrowly lanceloate, the segments filiform, irregu- 

 lar, fragile, nearly as long as the teeth ; annulus narrow ; spores 

 mature in fall. 



On bases of trees, stumps, and rocks, in woods ; Europe, 

 Asia, and from Newfoundland to British Columbia and south 

 to Florida and Cuba. Common in our region but usually 

 sterile. 



Allegheny : Along Brush Creek, near Douthett, April 



26, 1908, and June 5, 1909. O. E. J. ; Wild- 

 wood Road hollow, November 19, 1908. 

 O. E. J. and G. K. J. (Figured). 



