OF WESTERN PENNSYLVANIA. 43 



Westmoreland : In springy places along old road, Mellon's 

 estate, near New Florence, September 8- 

 11, 1907. O. E. J. 



19. Sphagnum inundatum Russow, VVarnstorf. 



Densely and deeply cespitose, gray or yellowish-green : 

 stems usually 15-30 cm. long, more or less completely sub- 

 merged; branches with moderately densely imbricate leaves; 

 stem-leaves usually somewhat fimbriate at the narrow apex, 

 little or not at all auriculate, fibrillose only above the middle; 

 branch-leaves dorsally richly porose in lateral bead-like rows, 

 ventrally with only a few pores located in the cell-angles. Other 

 characters are as described for the variety auriculatum. 



In wet meadows, wooded swamps, bogs, etc. In cooler 

 Europe, Asia, and North America. In our region, so far as 

 now known, represented only by the following variety : 

 19fl!. Sphagnum inundatum variety auriculatum (Warnstorf) 



Roth. 



{S. contortum var. la.vum Roell). 



(Plate V) 



Only moderately cespitose, green : stems in our specimens 

 only about 6-8 cm. high, only occasionally completely sub- 

 merged; wood-cylinder greenish, surrounded by a cuticular 

 sheath of one (occasionally unsymmetrically two) layer of in- 

 flated more or less distinctly porose cells; stem-leaves 1.2-1.5 

 mm. long, about three-fifths as wide, distinctly auriculate, to- 

 wards the apex somewhat concave, the margins narrowly uni- 

 formly hyaline-bordered and toward the apex involute, the 

 narrow apex somewhat dentate but not fimbriate; the hyaline 

 cells of stem-leaves broad, towards the lateral portions of the 

 base becoming narrower, usually septate, fibrillose at least as 

 far down as the middle of the leaf, or farther, and usually also 

 fibrillose at the base of the leaf, above ventrally with rather 

 small distinct pores in the cell-angles and usually other less 

 distinct lateral pores, above dorsally with small pores in cell- 

 angles and numerously along the sides of the cells ; of the 

 usually 5 fasciculate branches two are pendent and the others 

 short, usually 6-9 mm. long, variously widely divergent; 

 branch-leaves when dry very lax and widely divergent, 1.5-2 

 mm. long, ovate, very concave, with involute, narrowly and 

 uniformly hyaline-bordered margins, the apex narrow and 

 dentate-truncate; hyaline cells of branch-leaves rather long 

 and slender, richly fibrillose, dorsally with laterally-placed 

 bead-like rows of small pores about one-fifth as wide as the 

 cell, ventrally with small ringed pores in the cell-angles, oc- 

 casionally also a few laterally arranged indistinct pores ; cuti- 

 cular cells of branches large with a short neck and terminal 

 pore ; in cross-section the chlorophyllose cells narrowly elliptic 



