OF WESTERN PENNSYLVANIA. 37 



showing a yellowish or pale wood-cylinder, the cuticular sheath 

 composed of 3 or 4 layers of large cells; stem-leaves lingulate- 

 triangular from a wide slightly auriculate base, rather large, 

 about 1.2-1.8 mm. long by about three-fifths as wide, rounded 

 above to a narrowly erose-truncate apex, the margins narrowly 

 hyaline-bordered and somewhat involute towards the apex, 

 towards the base widely bordered ; hyaline cells of stem-leaves 

 in median basal portion and towards the apex widely rhom- 

 boid, in the upper half of the leaf septate, usually faintly fibril- 

 lose and occasionally porose, in the lateral basal portion 

 septate, rapidly becoming very narrow outwards and merging 

 there into the broad hyaline border ; branches usually 4 or 5 

 in a fascicle, usually 2 or 3 widely divergent, the comal short, 

 dense, and widely ascending to erect; branch-leaves oval to 

 ovate, about 1.5 mm. long, conca\'e, with involute narrowly 

 hyaline-bordered margins, above quickly narrowed to a rather 

 broad dentate-truncate apex; hyaline cells of branch-leaves 

 large, fibrillose, below ventrally with a few small rounded pores 

 in the cell-angles, the median lateral cells with a few larger in- 

 distinct pores, dorsally above with characteristic more or less 

 elliptic pores of about one-third the width of the cell and 

 situated in the cell-angles or along the sides ; in cross-section 

 the chlorophyllose cells rather broadly triangular, ventrally 

 free but dorsally enclosed between the highly convex hyaline 

 cells; cuticular cells of branches large, inflated, with a distinct 

 neck and apical pore: spores stated to be smooth, yellowish, 

 and about .021-.025 mm. in diameter. 



In bogs, etc., in Europe and, in North America, from New- 

 foundland to New England and south along the mountains to 

 the Carolinas. Rare in our region. 



Clinton: Along Hyner's Run abo\'e Hyner, July 14, 1908. 

 O. E. J. (Figured). 



13. Sphagnum plumulosum Roell, \\arnstorf. 

 (S. snbiiitens Russow and W'arnstorf ; S. acutifolinin var. siib- 

 iiiteiis Dixon). 



(Plate IV) 



Densely cespitose, pale to grass-green, usually reddish to 

 violet above: stem in typical specimens 10-1.^ cm. high, but 

 in our region usually about 6-8 cm. high, the wood-cylinder 

 green to red, the cuticular sheath distinct, 2-4-layered, -with 

 the outer cells largest: stem-leaves large, 1-1.5 mm. long, 

 broadly triangular Ungulate, the apex erose-truncate and 

 toothed, the hyaline border of margin narrow above, very wide 

 Iielow ; hyaline-cells of stem-leaves broadl}' rhomboidal to- 

 wards the apex and in median basal portion of leaf, towards 

 lateral basal portions rapidly much narrower and septate, all 

 non-fibrillose and non-porose ; branches 3-5 in a fascicle, 



