Jennings: Manual of Mosses — I. Sphagnales 27 



and upper more or less obtuse, the lower short-pointed; cuticular cells of 

 branches densely fibrillose, porose; branch-leaves usually densely but some- 

 times loosely imbricated, 1.5-2.0 mm long, broadly ovate, very concave, cucul- 

 late, the apex dorsally rough by erosion of the cell-walls, the margin consisting 

 of one or two very narrow cells which are often eroded away and the edge 

 left more or less dentate; hyaline cells of the branch-leaves rather densely 

 fibrillose, dorsally with a few rather large pores usually confined to the cell- 

 angles; chlorophyllose cells in cross-section small, elliptic, central, enclosed 

 deeply on both sides by the hyaline cells, the lateral walls smooth: capsule 

 considerably exserted; spores stated to be .024-. 028 mm, somewhat rust- 

 colored, finely punctulate. 



In bogs, etc. Almost cosmopolitan; in North America occurring from 

 Newfoundland to Alaska south to British Columbia and Florida. 



Butler Co.: On wet roadside at edge of woods, Semiconon Run, lYi mi. n. of 

 Conoqjenessing. Sidney K. Eastwood, March 24, 1935. Centre Co.: In a sinkhole 

 pond in the Barrens, near Scotia, July 17 and September 22, 1909. O.E.J, (figured). 

 Also from mountain bogs and glades in McKean, Clearfield, Clinton, Somerset, Fayette, 

 Forest, Westmoreland, and Warren counties. 



Section II. Lithophloea 



Cuticular cells of the stems and branches not reinforced with spiral fibers. 

 Branch-leaves more or less truncate and toothed at the apex. 



Subsection I. Polyclada 



Branches in fascicles of 7-13. Wood-strand of stem reddish brown. 

 Chlorophyllose cells of branch-leaves elliptical, central, the thick end walls 

 very narrowly exposed on both sides of the leaf. 



6. Sphagnum Wulfianum Girgensohn 



Plate II 



Loosely tufted, ours rather slender, 7-12 cm high, the uppermost short 

 branchlets congested to form a dense head; stem reddish-brown, in cross- 

 section with an outer layer of rows of somewhat inflated cells, underneath 

 which is a dense reddish-brown layer of small thick-walled cells inside of 

 which the central part of the stem consists of larger thin-walled cells; stem- 

 leaves lingulate-triangular, deflexed, non-fibrillose, border with a margin of 

 several rows of much narrower cells, the apex rather widely erose-denticulate; 

 branchlets in clusters of usually 3-5 spreading and 3-7 pendent, about 1.2-2 cm 

 long, the spreading branchlets slender and gradually tapering, the pendent 

 branchlets linear; their cortical cells non-fibrillose but with an apical pore; 

 branch-leaves about 1 mm long, when dry recurved-spreading, more imbricated 

 when wet but still with somewhat spreading points; branch-leaves ovate-lanceo- 

 late, often somewhat incurved-nibulose at apex, bordered with two or three 

 rows of linear cells, the apex often erose-bidentate, the median hyaline cells 

 fibrillose, about 8-10:1 at base, shorter above, dorsally with a few ringed pores: 

 chlorophyllose cells broadly elliptic, thick-walled, the lumen about central, but 



