260 A MANUAL OF MOSSES 



papillae; perichsetial leaves up to 4.5 mm. long, slenderly long- 

 acuminate, non-ciliate : seta about 2-2.5 cm. long, slender, 

 castaneous, lustrous, dextrorse above ; capsule oblong-cylin- 

 dric, arcuate, more or less inclined, the urn castaneous, 2.5-3 

 mm. long, when dry quite sharply bent and constricted at the 

 mouth; peristome as in T, dclicatnlum ; annulus large, decidu- 

 ous, pluri-seriate ; lid short-rostrate; spores with yellowish, 

 medium-thick, granular walls, about .012-.014 mm., mature 

 in midsummer. 



On the ground on rocks or on rotten wood in moist, 

 shaded woods; Europe, Asia, northern Africa, and from north- 

 ern Canada southeastward to Florida. Rather common in our 



region. 



Allegheny : On clay bank under hemlocks, AYildwood 



Road Hollow, March 29, 1908. O. E. J. 



and G. K. J. ; Guyasuta Hollow, October 



25, 1908. 6. E. J. 

 Armstrong : Kittanning, September 24, 1904. O. E. J. 



(Figured). 

 Clinton : Between Renovo and Haneyville, July 15, 



1908. O. E. J. 

 McKean : Langmade Hollow, May 3, 1896, Toad 



Hollow, June 17, 1896, and Bolivar Run, 



July 17, 1897, all near Bradford. D. A. B. 



11. ELODIUM (Sullivant) Warnstorf. 



Autoicous or rarely dioicous : more or less robust, in deep, 

 soft, slightly lustrous, green to yellowish-green or sometimes 

 brownish tufts : stems elliptic in cross-section, without central 

 strand, mostly simple, thickly-foliate, somewhat distichously 

 pinnate ; branchlets filiform ; paraphyses small, branched, 

 numerous ; leaves all similar, when dry appressed, when moist 

 erect-spreading, or erect, concave, with a dorsally projecting 

 main plication; stem-leaves from a narrowed base suddenly 

 lance-ovate, acuminate, the margin almost wholly revolute, 

 mostly entire, sometimes apically serrate ; costa incomplete, 

 mostly small ; cells pellucid, elongate-hexagonal to almost 

 linear, smooth or unipapillate over the lumen or in the cell- 

 angle, the basal cells laxly rectangular; branch-leaves smaller; 

 perichaetial leaves erect, pale, plicate, delicate, narrowly acumi- 

 nate, incompletely costate : seta 2-5 cm. long, smooth ; capsule 

 inclined to horizontal, oblong-cylindric, brown, more or less 

 arcuate ; annulus revoluble ; peristome-teeth broadly lance- 

 subulate, yellow, basally confluent, transversely striate, apical- 

 ly almost smooth, hyaline-bordered, high-trabeculate, the 

 plates numerous, and often forked or with transverse walls; 

 inner peristome yellowish, almost smooth, with high basal 

 membrane, carinate ; segments as long as teeth, lance-subu- 



