Jennings: Manual of Mosses — I. Sphagnales 39 



in the lower half of leaf the hyahne cells broad only in a narrow median strip 

 finked on both sides by narrow elongate cells, usually all hyaline cells of stem- 

 leaf non-fibrillose and non-porose; fascicu'ate branches usually 4, two very slen- 

 der and closely appressed pendent, and tv/o horizontally divergent, rather slen- 

 der, somewhat recurved, about 1-1.5 cm long, the comal branches short, obtuse, 

 ascending to erect; branch-leaves rather indistinctly five-ranked, when dry with 

 more or less spreading tips, ovate-lanceolate, concave, 1.5-2.0 mm long, the 

 margins uniformly narrowly hyaline-bordered and involute to the quite nar- 

 rowly acuminate and truncate-erose apex; hyaline cells of branch-leaves richly 

 fibrillose, ventrally with one or two large round m.edian pores of one-half to 

 two-thirds the width of the cell, these pores usually more numerous towards 

 the margin of the leaf, dorsally with quite numerous, small, elliptic, ringed 

 pores in the angles and along the sides of the cell; in cross-section the chloro- 

 phyllise cells narrowly trapezoidal with the ventral face wider, both faces 

 usually free, sometimes enclosed dorsally, the hyaline cells being dorsally quite 

 convex; the cuticular sheath of branches with Ions rectanc'ular cells with indis- 

 tinct necks and apical pores: spores for the species stated to be dark yellow, 

 minutely roughened, and about .025-. 030 mm in diameter. 



Mercer Co.: Near Houston Jet. J.A.S. July 12. 1902 (figured). 



21. Sphagnum fuscum (Schimper) Klingr 



{S. acutifolium var. fuscum Schimper) 

 Plate VIII 



Slender plants in dense, soft, deep, brownish tufts. Stems erect, about 

 5-10 cm tall. Branches usually 3, cf which two diverge almost at right angles, 

 then droop; the other branch hanging down alongside the stem. The diverg- 

 ent branches are about 1-1.5 cm long tapering to a slender attenuate tip. Stem 

 in cross-section showing 3-4 layers of larger, rounded-rectangular, thin-walled 

 cells, underlain abruptly by a layer of thick-walled, very much smaller reddish 

 brown cells, these grading abruptly into the central core of somewhat larger 

 colorless cells. Branch-leaves in lower third of divergent branches 1-1.4 (1.5) 

 mm long, somewhat spreading, lance-ovate, with upper margins incurved up to 

 a narrowly truncate toothed apex. Leaves in the attenuate tip lance linear and 

 clasping at base. Lower central hyaline cells of the branch-leaves about .115 

 mm long, transversely fibrillose, and with a few large dorsal pores, these being 

 mostly in pairs at the com.misures. Chlorophyllose cells narrowly triangular, 

 exposed, on both surfaces, but more so on the ventral surface, on the dorsal 

 surface deeply set between the strong convex hyaline cells. Stem-leaves nar- 

 rowly oblong-lingulate, not much, if any, v/idened at has, about 1.1-1.6 mm 

 long, about 2 J/2 to 3 times as long as wide, rounded and with a narrowly 

 erose apex. The border wide at the base, narrowing rapidly towards the apex. 



In our region it was collectpd in Waterman Swamp, Cattarasjus Co., soithwestcrn 

 N. Y. (Boehner. Science Studies, Bonaventure College, 9: 4. 1941) and at Mt. Jewett, 

 Potter Co., northern Pennsylvania. O.E.J. Sept. 12. 1922 (figured). Cravcford Co.: 

 Pymatuning Swamp, May 29-31, 1915. O.E.J. McKean Co.: Cathrine Swamp. C.M.B. 

 Pi. 82. Sept. 2, 1948. 



