Jennings: Manual of Mosses — I. Sphagnales 25 



ouj region and in the mountains, but mostly referred in the past to S. cymbi- 

 jolium. 



Common and now known from 14 counties in western Pennsylvania. Specimen figured: 

 Open bog. Bear Meadows, Center Co., Pa., Sept. 21. 1909. O.E.J. 



3a. Sphagnum afftne i. sqtiarrosula Warnstorf, is merely a strong grow- 

 ing form with the upper half of the leaves of the branches when dry strongly 

 squarrose. All gradations between the typical form and the squarrose form 

 are to be found in our region. A packet of specimens quite characteristically 

 of the squarrose form is as follows: 



Cambria Co.: On boggy plateau near St. Lawrence, July 24, 1098. O.E.J. (Mixed 

 with S. recuryum Schwaegrichen ) . 



4. Sphagnum palustre Linnaeus 



{S. cymbifolium Ehrhart; S. latijolium of 1st edition) 



Plate I 



Densely cespitose, usually robust, bluish or glaucous-green to yellowish: 

 stems rather stout, usually 8-10 cm long, sometimes 2-3 dm long, the cuticular 

 sheath composed of 3-4 layers of inflated cells, the innermost of which are the 

 largest, the outer layer being rectangular, fibrillose and porose, the wood- 

 cylinder being usually yellowish or brownish; stem-leaves large, about 2 mm 

 long and 1.25 mm broad, sometimes 3 mm long, spatulate-lingulate, the 

 broadly rounded apex somewhat erose-fimbriate, below narrowly hyaline-bor- 

 dered, the insertion composed of brownish and incrassate cells; lower hyaline 

 cells of stem-leaves sometimes septate, non-porose, non-fibrillose, those of the 

 upper one-half or two-thirds of the leaf fibrillose and porose as are the branch- 

 leaves also, towards the apex the hyaline cells much broader relatively, often as 

 broad as long; branches in different plants variable, 1-2.5 cm long, more or 

 less turgid below, acutely tapering at the apex, usually tv/o spreading with 

 drooping tips and two pendent and closely appressed to the stem, the comal 

 short, ascending, more or less blunt; the branches in cross-section showing a 

 layer of inflated cuticular cells which are rectangular, porose, and fibrillose; 

 branch-leaves usually about 2 mm long, sometimes 3 mm, widely ovate, very 

 concave, the margins involute, the apex abruptly and bluntly tapering, cucul- 

 late, at back somewhat scabrous with the erosion of the outer cell-walls, when 

 dry the leaves being more or less closely imbricate; hyaline cells of branch- 

 leaves broad, fibrillose, ventrally porose with large lateral pores mainly con- 

 fined to the cell-angles, the pores often equalling one-third the width of the 

 cell, dorsally the pores somewhat smaller and more elliptic and lateral, mostly 

 in the cell-angles; in cross-section the chlorophyllose cells are narrowly barrel- 

 shaped or somewhat trapezoidal, exposed on both faces, being ventrally nearly 

 flush with the ventral surface of the hyaline cells but the latter dorsally very 

 convex and projecting much beyond the chlorophyllose cells, the lateral walls 

 of the chlorophyllose cells smooth; perichstial leaves very large, broad'y oval, 

 cucullate, hyaline-bordered, rounded obtuse at apex: capsule at maturity con- 

 siderably exserted above the comal tuft; spores yellow, .028- 033 mm, mature 

 in mid-summer. 



