Jennings: Manual of Mosses — I. Sphagnales 23 



may be best to follow Andrews and regard species number three (S. affine) as 

 a variety of S. imhricatum, the latter possessing comb-ftbrils, while S. imbri- 

 catiim var. ajfine entirely lacks them. 



la. Sphagnum imbricatum var. sublaeve Wamstorf 



(S. Austini var. glaucum f. squarrosulum Roell) 



Rather densely cespitose, large, usually more or less glaucous-green, gray- 

 ish or yellowish below; stems rather stout, with us about 4-8 cm long, the 

 wood-cylinder greenish or yellowish and surrounded by a cuticular sheath of 

 uaually four layers of thin-walled, large, fibrillose, and porose cells, the inner- 

 most largest; stem-leaves about 1-1.8 mm long, widely and blundy lingulate, 

 somewhat concave, the upper half rounded and with an erose-fimbriate margin, 

 the base more or less auriculate; hyaline cells of stem-leaves mosdy non-fibril- 

 lose and non-porose. a few often septate, the upper median more or less rcunded- 

 hexagonal, the basal elongate, the insertion-cells small and brownish-incrassate; 

 branches usually four, two or three spreading, tumid, about 1.5 cm long, the 

 rather shortly tapering apex pendent, the comal branches short and more or 

 less erect-spreading, often obtuse, the pendent branches closely applied to the 

 stem, very slender; branch -leaves 2-3 mm long, broadly ovate, very concave, th? 

 margins involute, the apex abruptly and bluntly tapering, cucullate and more 

 or less widely squarrose-spreading; the hyaline cells of the branch-leaves broad, 

 fibrillose, ventrally with a few large round median pores, with small pores in 

 the angles, dorsally with large round or elliptic pores at the cell-angles, the 

 large pores usually equalling about one-third the width of the hyaline cell; the 

 basal hyaline cells of the branch leaves are distinctly comb-fibrillose on the 

 inner lateral side of the wall adjoining the chlorophyllose cells; in cross-section 

 the chlorophyllose cells are widely trapezoidal, the ventral wall widest and 

 almost or quite as wide as the lateral walls, the dorsal wall exposed between 

 the highly convex dorsal walls of the hyaline cells and usually one-third to one- 

 half the width of the lateral wall; the cuticular sheath of the branches con- 

 sisting of one layer of rectangular, fibrillose, porose cells: fruit not seen, but 

 spores of S. imbricatum are stated to be yellowish, smooth, and about .025 

 mm in diameter. 



This variety is probably well distributed in regions where the typical form 



occurs. 



Crawford Co.: Pymatuning Swamp, near Linesville, May 12, 1908. O.E.J, (fig- 

 ured). Fayette Co.: Ohio Pyle and Wiggins. C.M.B. Mercer Co.: Near Houston 

 Junction. July 12, 1902. J.A.S. Somerset Co.: Clear Run. C.M.B. Warren Co.: 

 Columbus, P. 168. Sept. 1948. C.M.B. 



2. Sphagnum papillosum Lindberg 



{S. cymbifolium var. papillosum Schimper) 

 Plate II 



Vigorous, coarse, tufted, yellowish to ochraceous: stems reddish-brown, 

 almost 1 mm in diameter, inflated cuticular cells porose towards apex, scarcely 

 if at all fibrose; divergent branches 1 or 2, pendent 1 or 2; divergent branches 



