OF WF-TERX PENNSYLVANIA. 



14i,-. Sphagnum ca^i'Hfolium variety viride \\"arnstorf i \ew 



Combination. 



( S. (icu.'ifoHum var. \'iridc XVarnstorf ). 

 (Plate IV) 



Rather densely cespitose, low, yellowish above, greenish 

 to yellowish-green below, lacking the reddish tinges so often 

 characteristic of the species: stems slender, in our region 

 usually 5-8 cm. long, in cross-section showing a yellowish 

 wood-cylinder and a distinct cuticular sheath of 2-4 layers 

 of large but non-porose cells ; stem-leaves oval-triangular to 

 lingulate-triangular, 1-2 mm. long, always widest at the base, 

 towards the apex abruptly narrowed to a truncate apex with 

 a few teeth, the upper margin usually somewhat involute, the 

 margin narrowly hyaline-bordered, the border sometimes wider 

 at the base ; hyaline cells of stem-leaves largely once-septate, 

 especially below the middle, those of the upper half of the 

 leaf usually more or less completely fibrillose and sometimes 

 distinctly laterally porose ; branches fairly numerous, usually 

 in fascicles of four, two spreading-recurved and two appressed- 

 pendent and very slender; the cuticular sheath of branches 

 composed of cells with a distinct neck and terminal pore; 

 branch-leaves 1-2 mm. long, ovate-lanceolate, when dry hard- 

 ly secund but with slightly spreading tips, concave, with in- 

 volute margins above, uniformly narrowly hyaline-bordered, 

 the narrow apex somewhat erose-dentate; hyaline cells of 

 1 ranch-leaves rather slender, abruptly fibrillose. with small 

 somewhat elliptic pores at the cell-angles, sometimes also 

 lateral pores of a similar character between the angle-pores on 

 both sides of the leaf, while towards the margin of the leaf 

 the pores are often larger and more numerous; in cross-sec- 

 tion the chlorophyllose cells are more or less trapezoidal, 

 unusually short, free on both surfaces but the hyaline cells 

 projecting far beyond them both ventrally and dorsally, es- 

 pecially dorsally ; perichaetial leaves said to be very large and 

 broadly ovate : spores yellow, smoothish. 



In boggy situations throughout Europe and North 

 America, occurring also in Asia, South America, and in the 

 regions of the South Pacific. In our region not common. 



Fayette : In hollows along rocky river-bed above the 

 falls. Ohio Pyle, July 4, 1908. O. E. J. 

 ( Figured). 



15. Sphagnum contortum Schultz. 

 (S. subsecniuhiin var. contortnm Huebener ; S. laricimnn Spruce). 



Loosely cespitose, green to brownish or yellowish, some- 

 times more or less purplish above; stem about 6-12 cm. high, 

 the wood-cvlinder reddish to brownish, surrounded by a dis- 



