304 A MANUAL OF MOSSES 



1. Ptilium crista-castrensis [Linnaeus] DeNotaris. 

 {Hypnitm crista-castrensis Linnaeus; .Stereodon crista-castrensis 

 Mitten). 



(Plate XLV) 



An easily recognized, rigid, robust, plume-like, bright yel- 

 lowish-green species : stem-leaves about 2-3 mm. long ; median 

 leaf-cells about 10-20:1; branch-leaves not usually reaching 

 2 mm. in length; exothe.cial cells strongly castaneous-incras- 

 sate, small and rounded in several series at the rim, below be- 

 coming oblong-rectangular ; peristome-teeth castaneous, large, 

 strongly trabeculate, lamellate, crosswise faintly and finely 

 dorsally papillose-striolate, confluent below ; segments as long 

 as teeth, yellowish, papillose; the basal membrane about one- 

 half as high; cilia 2-4, slender, hyaline, about as long as the 

 segments, nodose-appendiculate ; spores smoothish, castane- 

 ous, medium-walled, about .010-014 mm., usually mature in 

 early autumn. 



On woods-humus, rotten logs, and moist earth, in woods, 

 usually in mountainous regions ; Europe, Asia, and from Arctic 

 America south to the northern United States and southwards 

 in the mountains to North Carolina. Not uncommon in the 

 more mountainous portions of our region. 



Cambria : Cresson. T. C. Porter. (Porter's Cata- 



logue). 



Blair : A. P. Garber. (Porter's Catalogue). 



Clinton : Deep mountain woods above Renovo, 



July, 1908. O. E. J. 



Elk : McMinn. (Porter's Catalogue). 



Fayette : Forming a thick mat on rock in deep 



wooded ravine four miles south of Ohio 

 Pyle, September, 1-3, 1906. O. E. J. 

 and G. K. J. 



McKean : D. A. Burnett. (Porter's Catalogue). 



Somerset : Allegheny Mountains^ August 17, 1875. 



B. H. Patterson. (Figured). 



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



17. STEREODON Bridel, Mitten. 



Mainly dioicous: robust to quite slender, green to yel- 

 lowish-green or golden-brown, lustrous: stems elongate, de- 

 cu;mbent or ascending, rarely erect, mostly non-stoloniferous, 

 simple o;- divided, irregularly or rarely regularly pinnate, the 

 shoots mostly with hooked or .qrcinate ends ; l,e'a^■es 2-seriate, 

 falc^te-secund, non-decurrent or but slightly so, rather concave, 

 ovate- to cordate-lanceolate, acuminate to more or less subu- 

 late-acuminate ; costa short and double or none ; leaf-cells nar- 

 rowly prosenchymatous, smooth on both sides, the basal most- 



