OF WESTERN PENNSYLVANIA 261 



late, entire or very narrowly carinately split, cilia 3, complete, 

 delicate, smooth ; lid convex-conic, acute ; calyptra cucullate, 

 glabrous; spores about .010-.016(-.024) mm. 



A genus of four species, at least one of these in our region. 

 1. Elodium paludosum (Sullivant) Loeske. 

 (Hypnum paludosum Sullivant ; Thuidium paludosum Jaeger 

 and Sauerbeck). 



(Plate XXXVI) . 



Yellowish-green, irregularly pinnate : primary stems 

 creeping, branchlets distichous, unequal : stem-leaves some- 

 what rigid, about 1-1.5 mm. long, erect-spreading to somewhat 

 appressed, lance-oblong, acuminate, somewhat cordate at base, 

 concave below, reflexed on the borders, smooth on both faces, 

 at the base bearing 1 to 3 paraphyllose branched filaments, 

 the base decurrent, plicate-striate ; costa sub-percurrent ; 

 median leaf-cells shortly linear-oblong to linear-rhomboid, 

 usually smooth, sometimes dorsally lightly papillose at the 

 distal end; stems and branches with numerous filamentous 

 and branched paraphyllia; branch-leaves narrower, smaller, 

 usually 0.6-0.8 mm. long; inner perichsetial leaves oblong, 

 gradually slenderly acuminate, up to 3 mm. long, longitudinal- 

 ly plicate: seta about 1.5-3 cm. long, slender, red-castaneous, 

 dextrorse above ; capsule oblong-cylindric, curved, strongly in- 

 clined to almost horizontal, about 3:1, the urn about 3-3.5 mm. 

 long ; lid conic, apiculate ; peristome normally hypnoid, large, 

 the teeth rather broadly lance-acuminate, densely trabeculate, 

 the lower trabeculse often forked and thus united by obliquely 

 transverse bars, the dorsal lamellae numerous and below dense- 

 ly cross-striate, yellowish ; segments as long as teeth, carinate 

 but rarely split, the basal membrane about one-third as high 

 as teeth, the cilia 3, nodose or appendiculate above, nearly as 

 long as segments ; spores mature in winter, about .018-022 

 mm., medium-walled, yellowish, granular; annulus large. 



In wet, grassy fields, swamps, and bogs"; Asia, and from 



New England to Ontario and south to Illinois and Delaware. 



Probably rather common in the northern part of our region. 



Allegheny : Swampy ground near Douthett, about on 



boundary line of Butler and Allegheny 



Counties, April 26, 1908. O. E. J. 

 Butler : Swampy ground near Crider's Corners, 



April 26, 1908. O. K J. 

 Crawford : Pymatuning Swamp, near Linesville, June 



12, 1905. O. E. J. (Figured). 



