OF WESTERN PENNSYLVANIA 255 



becuhe ; segments about as long as teeth, carinate ; cilia (1-) 

 2-3, nodose-articulate, the basal membrane about two-fifths 

 the height of the peristome ; exothecial cells incrassate, quad- 

 rate to oblong-hexagonal, about three series in the rim much 

 smaller and rounded ; spores incrassate, yellowish, faintly 

 papillose, about .011-.014 mm., mature in spring. 



On the ground or on roots of trees in rather open woods ; 

 from Xew England to Minnesota and Mexico, also in Europe. 

 Quite common in our region. 



Blair : Bald Eagle Valley. T. C. Porter. (Por- 



ter's Catalogue). 



Cambria : Cresson. T. P. James. (Porter's Cata- 



logue). 

 Center : Tussey's Mt., above Shingletown, July 



15, 1909. O. E. J. 



Fayette : On woods-humus, Meadow Run Valley, 



four miles south of Ohio Pvle, September 

 1-3, 1906. O. E. J. and G. K. J. 

 Huntingdon : \Yarriors Ridge, above Huntingdon, July 



20, 1908. O. E. J. (Figured)/ 



Westmoreland: Two miles south of TrafTord, August 21. 



1910. O. E. J.; Laurel Hill Mt., Mellon's 

 estate, on soil with Diphyscium foliosuui, 

 September 8-11, 1907. O.'E. J. 



2. Haplocladium microphyllum (Swartz) Brotherus. 



(H\pnum gracilc Bruch and Schimper ; Thuidium microphyllum 

 Best). 



(Plate XXXV) 



Medium size, pale green to yellowish, appressed-matted : 

 stems diffusely divided, densely pinnately branched ; stem- 

 leaves broadly ovate to lance-ovate, up to 1.2 mm. long, con- 

 cave, long and narrowly acuminate, the margins entire or sinu- 

 ately denticulate ; costa almost percurrent ; leaf-cells quadrate- 

 hexagonal, somewhat incrassate, the apical and a very few of 

 the basal elongate, all strongly uni-papillate ; branch-leaves 

 narrower and smaller, up to 1 mm. long ; paraphyllia numerous 

 and branched on the stem but simple and few or none on the 

 smaller branches ; inner perich?etial leaves high-sheathing, 

 long-acuminate, costate, up to 2.5 mm. long: seta up to 2 or 

 2.5 cm. long, castaneous, twisted, somewhat arcuate above; 

 capsule turgid-oblong, about 2-2.5:1. about 2 cm. long, dorsal- 

 ly somewhat turgid, when mature somewhat inclined or pend- 

 ent by the curving of the upper part of the seta; lid short- 

 conic, mamillate : peristome normally hypnoid, the teeth yel- 

 lowish, densely trabeculate, dorsally with rather indistinct 

 lamellae and divisural, finely cross-striate, narrowly hyaline- 

 margined : segments carinate, about as long as teeth ; cilia 2 to 



