Jennings: Manual of Mosses — I. Sphagnales 33 



purplish above: stem about 6-12 cm high, the wood-cylinder reddish to brown- 

 ish, surrounded by a distinct two-layered sheath of inflated cells; stem leaves 

 small, about 1 mm long, broadly lingulate or triangular-lingulate, the hyaline 

 border much broader towards the br.se, the apex broadlv rounded and mere or 

 less concave, cucullate, and erose-fimbriate; hyaline cells of stem-leaves in upper 

 third fibrillose, short and broad, ventrally with a few cells in the angles, dor- 

 sally with more numerous small ringed pores along the sides of the cell, very 

 few of the hyaline cells septate, the lower ones long and narrow; fasciculate 

 branches 3-5 to a fascicle, usually two slender and closely appressed pendent, 

 two divergent and recurved; branch-leaves about 1.5-2 mm long, broadly ovate 

 to lanceolate, more or less sharply acuminate, the upper margin involute and 

 narrowly hyaline-bordered, leaves when dry more or less subsecund and sub- 

 lustrous; hyaline cells richly fibrillose, slender, ventrally almost poreless, dor- 

 sally with small ringed pores more or less completely arranged in bead-like 

 rows, the pores most numerous towards upper margins of leaf; in cross-section 

 the chlorophyllose cells narrowly barrel-shaped, with both faces free and their 

 walls there somewhat thickened; cuticular cells of branches apical ly porose: 

 sp>ores not seen but reported as .020-. 030 mm in diameter, yellowish-brown, 

 finely roughened. 



In swampy meadows, along ditches, margins of bogs, etc., in Europe and, 

 in North America from Greenland to Mexico, and along the Pacific Coast 



Not heretofore reported from our region but a specimen collected by J. A. 

 Shafer, October 20, 1901, at Ohio Pyle, Fayette County, with stem-leaves 

 about .7-.8 mm long, with the margin uniformly hyaline-bordered and the 

 hyaline cells fibrillose to below the middle of the leaf is now referred here; 

 also a specimen from Centre Co., Neil D. Richmond, June 14, 1950. 



13. Sphagnum platyphyllum (Sullivant) Warnstorf 



(S. auriculatum Aongstroem; S. isophyllum Russow) 

 Plate V 



Loosely cespitose, brownish- to grayish-green: stems in our region up to 

 10 cm high, slender, rather weak and sparsely branched; stem in cross-section 

 showing a usually brownish wood-cylinder, with a distinct cuticular sheath of 

 rather small, thin-walled, and usually uni-porose cells; stem-leaves large, usually 

 1.3-2.0 mm long, oval to oblong from an auriculate base, very concave, the 

 apex blunt and a little toothed or erose, the margin narrowly and uniformly 

 bordered; hyaline cells of the stem-leaves in lower half to two-thirds of the leaf 

 non-fibrillose and non-porose but some of them septate, in the upper half or 

 one-third of the leaf the hyaline cells fibrillose and on both sides with lateral 

 rows of small pores; branches usually 3, sometimes 4, usually spreading with 

 recurved tips, one or two being pendent and very slender; branch-leaves broadly 

 ovate, very concave, usually 2-3 mm long, the apex toothed, the margin more 

 or less incurved and with a narrow and uniform border; in cross-section the 

 chlorophyllose cells barrel-shaped, free on both surfaces, the hyaline cells 

 about equally convex on both sides; hyaline cells fibrillose, with numerous 

 small lateral pores on both sides; \\hen dry the leaves towards the base of the 



