OF WESTERN PENNSYLVANIA 315 



Ohio Pyle, July 4, 1908, and May 30-31, 

 1903. O. E. J. (Figured as to old capsule 

 and peristome.) 



McKean : Bennett Brook, September 10, 1894, Gates' 



Hollow, October 27, 1895, and November 

 4, 1895, and Langmade Hollow, April 26, 

 1896. All near Bradford. D. A. Burnett. 



Somerset : Keystone, October 9, 1904. O. E. J. 



Westmoreland: Mellon's estate (Rachelwood) on Laurel 



Hill Mts., September 8-10, 1907, and 

 "Shades," near Blackburn, March 25, 1910. 

 O. E. J. and G. K. J. 



10. Stereodon delicatulus (James) Brotherus. 



(Hypnum laxepatulum Lesquereux and James; Rhynchosteginni 

 delicatulum James; Sematophyllum delicatulum E. G. Brit- 

 ton; Rhaphidostegiuin delicatnliun Paris). 

 Small, depressed cespitose, dark green, scarcely lustrous : 

 stems slender, prostrate, subpinnately branching ; leaves rather 

 open, falcate-secund. two-ranked, sharply serrulate towards 

 the apex; costa none or very short and double; leaves con- 

 cave, ovate, narrowed into a long acumination ; a few of the 

 extreme alar cells much enlarged and inflated as in S. rcciin'ans, 

 colored or hyaline, bordered by a few sub-quadrate and smaller, 

 the median linear-flextious, prosenchymatous; perichaetial 

 leaves non-plicate, sharply serrate above: seta shorter than in 

 vS". recitri'ans ; capsule ovoid-oblong, curved, inclined, about 

 2-3:1, urn about equalled in length by the slenderly long- 

 rostrate lid ; peristome hypnoid, segments entire, cilia usually 

 one or two; spores mature in late fall. 



On rotten wood, or soil, or at the base of trees, mainly in 

 the mountains from Xew England to Alabama. Rare in our 



region. 



McKean : Bradford. D. A. Burnett. (Porter's Cata- 



logue). 



11. Stereodon tenuirostris (Bruch and Schimper) Brotherus. 



(Sematophyllum tenuirostre E. G. Britton ; Hypniun cylindrocar- 

 piun C. Mueller; Rhaphidostegiuin cylindricarpum Jaeger). 



(Plate XLVII) 



Flatly and broadly cespitose in thin intricate mats, slen- 

 der : stems prostrate, reddish, or green, p innately branched, 

 branches few, slender; stem-leaves sub-lustrous, 1.5-2.5 mm. 

 long, falcate-secund but not complanate, narrowly lance-ob- 

 long, non-decurrent, acuminate, concave, apically serrate, 

 marginally somewhat reflexed to the base of the acumen ; 

 median leaf-cells linear-prosenchymatous, the apical usually a 

 little larger, the alar few in number, inflated, sub-quadrate, 



