BARNES — NORTH AMERICAN MOSSES. 255 



■with 4r-6 large teeth; margin faintly bordered, toothed above, involute far 

 down, loosely erect spreading; hyaline cells broad rhombic to rhomboidal, 

 inner surface near apex with small faintly ringed pores, towards middle in 

 side regions with few large pores, outer surface with numerous narrow 

 elliptic pores gradually larger towards the leaf base and margins, fibrils 

 very numerous. Hedwigia 31: 174. 1892. — Newfoundland; New Jersey. 



12. 8pha§^iLuiii Floridanum Card. — Differs from S. inacrophyllum by 

 more numerous pores of stem leaves (4-10 in each cell); shorter pointed 

 branch leaves, rounded obtuse, not tubulose, canaliculate and cucullate at 

 summit; hyaline cells narrower, pores small and very numerous, 40-60 

 upon each face in large cells of middle, biseriate, entirely at one end of the 

 cell, or uniseriate: fruit unknown. Cardot, R§v. des Sphaignes de 1' Ameri- 

 que du Nord 22. 1887. — Florida; Louisiana. 



13. Sphagnum riparium Aongstr. — Cortex of stem wanting: stem 

 leaves very large, reflexed, triangular Ungulate, apex rounded, deeply two 

 cleft by resorption of membranes, always without fibrils, borders entirely 

 of green cells with pits: fascicle of 4-5 branches: leaves narrowly bordered, 

 when dry somewhat crispate, middle ones with squarrosely reflexed points, 

 chlorophyllose cells exposed on both faces, pores on concave leaf surface 

 quite large and numerous along the commissures, membranes resorbed at 

 upper end of cells on convex surface for entire breadth of leaf in middle 

 or side regions, in other cases with 2-4 large pores instead: perichsetial 

 leaves with the lower % composed mostly of pitted chlorophyllose cells. 

 Limpr. Laubm. 1: 133. — New Hampshire; New Jersey; Canada; Greenland; 

 Alaska; Behring Sea. 



14. Sphagnum Dusenii Jensen. — Strong to robust, green or yellowish- 

 green: wood body green or yellow, formed of quite thick-walled cells; cor- 

 tex of 5 layers of cells with weakly thickened walls: stem leaves triangular 

 lingulate, apex with few large teeth, generally fibrous in upper half, border 

 broad: branches 4 in each fascicle, 2 divergent often long and attenuate: 

 leaves crowded or loosely imbricate, seldom secund, large (2X1 mm.), 

 broad oval lanceolate, above with incurved margin; hyaline cells long aud 

 narrow, below 15-20 X 2.5-3//, strongly fibrous, on convex side with num- 

 erous round or oval pores (5-7/i diam.) with weakly thickened edges, on 

 concave side with single rather distant round pores along sides of broad 

 part, all pores somewhat distant from chlorophyll cells, often forming 1 or 2 

 rows: dioicous; g branches acute, with yellowish brown bracts, 9 branches 

 short or elongated, their leaves broadly oval with hyaline cells at base and 

 fibrous in upper half: capsule brown; spores 2/i diam., yellow and finely 

 papillose: seldom fruiting. S. majus Eussow; Jensen in De danske Sphag- 

 num-Arter, Festskrift bot. Foren. Copenh. 50-aarsfest 106. 1890. Anti- 

 costi; Maine; New Hampshire; New York; Wisconsin. 



15. Sphagnum Mohrianum Warnst. — Stem leaves large, narrow at 



