BARNES NORTH AMERICAN MOSSES. 253 



without fibrils or pores. Bot. Gaz. 15: 135. 1890. In elevated bogs: N. E. 

 United States: Newfoundland; eastern Canada. 



6. Sphagnum fuscum Klingg. In extensive, dense or loose, often cush- 

 ion-shaped patches; stems usually slender and delicate: stem leaves usually 

 small, linguiform, often at rounded apex abruptly contracted to a small 

 cucullate point, which is generally somewhat fimbriate, border broader 

 below; hyaline cells nearly always without fibrils and pores, 2-4-divided 

 by obliquely transverse walls, and with delicate longitudinal plaits in 

 membrane: fascicles of 3-4 branches: leaves small, nearly lusterless when 

 dry, densely or loosely imbricated, from an ovate base extending to a 

 comparatively short round-truncate dentate involute tip; border 3-4 cells 

 wide; hyaline cells on inner side of leaf in upper part with numerous 

 usually ringless pores, especially in upper and lower cell angles, pores in 

 middle of cell, near margin and base, outer surface with numerous pores: 

 dioicous: perichaetial leaves large, ovate, slightly emarginate at rounded 

 apex, hyaline cells without fibrils and pores: fruit rare. Bot. Gaz. 15: 

 133. 1890. In elevated bogs: N. United States; Newfoundland; Canada. 



7. Sphagnum qninqnefarinni Warnst. Plants slender and delicate like 

 S. Warnstorfii or strong and robust like S. Russowii: stem leaves from 

 a broad base deltoid, not linguiform, above at often abruptly contracted 

 apex truncate, dentate, usually involute and bordered at edge, border wider 

 below; hyaline cells in whole middle part of leaf broad, in upper half al- 

 most rhombic, often once or several times divided by oblique transverse 

 walls and with membrane plaits, without fibrils and pores oftener than 

 with them: fascicles of 5 branches, 3 spreading; branches 5-angled by 

 5-ranked leaves: branch leaves loosely or closely imbricate, never secund, 

 small, ovate-lanceolate, at usually round-truncate involute-edged and den- 

 tate apex bordered by 2-3 rows of narrow cells, upper part of inner surface 

 porose, pores small, ringed, in upper and lower cell angles, in broader part 

 of leaf and near margins pores larger and not ringed, outer surface with 

 numerous pores along commissures: commonly monoicous, more rarely 

 dioicous: perichaetial leaves large, ovate, above drawn out to a longer or 

 shorter emarginate involute-edged apex: fruit not rare: spores fine, smooth. 

 Bot. Gaz. 15: 189. 1890. Newfoundland; Canada; E. United States. 



8. Sphagnum tenerum (Aust.) Warnst. Stem leaves large, isosceles- 

 triangular, mostly with cut edges and a quite long obtuse toothed acumen 

 with incurved edges; border suddenly broadened at base; hyaline cells 

 often divided by oblique walls and mostly fibrillose to base, inner side 

 porose, pores large, round, outer side with half elliptic pores along com- 

 missures: fascicles generally 4-branched: branch leaves quite large, ovate- 

 lanceolate, regularly imbricate; apex obtuse, toothed, margins involute; 

 hyaline cells on inside with large round pores near sides and small pores 



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