310 A ]\1 AN'L'AL OF MOSSES 



5. Stereodon curvifolius (Hedwig) Mitten. 

 (Hypnnm cnrrifoliiun Hedwig). 



(Plate XLVI) 



Robust, lustrous, yellowish-green in large flat mats : stems 

 prostrate, rather regularly pinnately branched, the branch- 

 lets short and unequal, the whole plant complanately secund ; 

 leaves crowded, imbricate in two rows, falcate-secund, thus 

 giving to the plants a plaited appearance from the dorsal view- 

 point ; stem-leaves about 0.7-0.8X1-4 1-8 mm., oblong-ovate 

 to elongate and triangular-ovate, short-acuminate, plane-mar- 

 gined, crenulate-serrulate about to the middle, and at the 

 angles, concave, at the base abruptly narrowed and cordate or 

 sub-cordate, somewhat decurrent ; costa none or double and 

 faint ; branch-leaves similar but proportionally shorter and 

 narrower, about 0.40.5X1-1-5 mm.; median leaf-cells about 

 .005-.007X-035-.050 mm., linear-vermicular, basal median cells 

 incrassate, porose, more or less vermicular to linear-oblong, a 

 few of the alar cells sub-quadrate, yellowish or brownish and 

 incrassate, about .020-.025 mm. in diameter, the decurrent cells 

 enlarged, thin-walled, and hyaline ; perichaetial leaves erect, 

 whitish, numerous, the inner sheathing, plicate, reaching 4-5 

 mm. long: seta about 2.5 cm. long, dextrorse above, sinis- 

 trorse below, castaneous, sub-lustrous ; capsule about 2.5 mm. 

 long, pale castaneous, constricted below the mouth when dry 

 and empty and then also strongly plicate, the urn oblong, 

 arcuate, cernuous ; lid conic, apiculate ; peristome normally 

 hypnoid, teeth yellowish pellucid, slender, strongly trabeculate, 

 the lamellse and divisural distinct, the apical portion of the 

 teeth hyaline and papillose, the lower dorsal surface cross- 

 striolate : segments about as long as the teeth, slender, slight- 

 ly carinately cleft, pale yellowish-pellucid, cilia two or three, 

 about as long as segments, articulate, hyaline, papillose ; 

 annulus 3-seriate, revoluble ; spores yellowish, medium-walled, 

 granulose, about .019-.023 mm., mature in early spring. 



On rocks or more usually on decaying logs in moist \voods ; 

 Asia, and from Arctic America south to Florida and Colorado. 

 Common in our region. 



Armstrong : Kittanning, on rotten log, August 16, 



1905. O.'E. T. 

 Beaver : Beaver Falls, May 11, 1907. O. E. J. 



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



logue). 



Crawford : Linesville, Pymatuning Swamp, June 11- 



12, 1907, May 12, 1908 (Figured), and 

 August 3, 1909. O. E. J. 



Erie : Presque Isle, Tune 8-9, 1906. O. E. T- 



