252 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



three plaits near the base: dioicous, rarely monoicous: perigonial leaves 

 resembling the branch leaves; perichastial leaves as in S. Girgensohnii; 

 fruit rare. Bot. Gaz. 15: 130. 1890. Hedwigia 25: 225. 1886. Newfound- 

 land; Labrador; Canada; New Brunswick; Maine; New Hampshire; Rocky 

 Mountains; Washington. 



3. Sphagnum Warnstorfii Russ. Tufts mostly loose; plants usually 

 delicate, slender and graceful, and at the same time firmly erect: stem 

 leaves small to medium sized, mostly linguiform, from base very gradually 

 narrowed and then rather abruptly contracted into a roundish pointed 

 dentate or entire apex; border narrow, much widened downwards; hyaline 

 cells of upper half of leaf rhombic to elongate rhombic, mostly divided but 

 nonfibrillose: fascicle of 3-5 branches of which 2-3 are spreading: leaves 

 of the latter ovate in basal half, involute above and subulate, truncate and 

 3-5 toothed, often regularly 5 ranked, sometimes secund, always with their 

 points diverging from each other; hyaline cells from basal half of spread- 

 ing branches with numerous pores on outer surface: dioicous: pericheetial 

 leaves large, ovate-lanceolate, in lower part consisting of chlorophyllose 

 cells only; hyaline cells of upper part non-fibrillose: capsule comparatively 

 large, dark reddish brown. Bot. Gaz. 15: 138. 1890. Damp or wet birch 

 swamps, margins of elevated bogs when adjacent to birch-covered wet 

 meadows, or in springy swamps: Newfoundland; Labrador; Massachu- 

 setts; New Hampshire; Connecticut; Minnesota; Montana; Rocky Moun- 

 tains; Alaska. 



4. Sphagnum Vancouyeriense Warnst. Stem leaves without fibrils 

 and pores, rounded apex suddenly narrowed to a short often obtuse and 

 toothed acumen, border up to 10 cells broad and very much broadened 

 toward base; membrane of hyaline cells sometimes very thin or (par- 

 ticularly in upper part) resorbed on both sides: branch leaves when dry 

 curved, erect spreading, on inside in region of margins with many large 

 round pores, on outer face with medium sized to large pores along com- 

 missures. Hedwigia 33: 308. 1894. Vancouver Island. 



5. Sphagnum tenellum Klingg. Tufts soft; plants generally quite 

 slender: stem leaves larger or smaller, linguiform, usually cucullate in- 

 curved at apex, and sometimes at sides, and afterwards by spreading out 

 flat becoming lacerate dentate or delicately fimbriate; hyaline cells with 

 or without fibrils in upper part of leaf: fascicles of 3-4 branches, 2 diverg- 

 ing: branch leaves loosely or densely imbricate, frequently secund, ovate 

 to ovate-lanceolate, small, dentate at broad rounded apex, margin involute, 

 apical half of inner surface with numerous small pores, especially in upper 

 and lower cell angles, and larger ones in broader part of leaf, especially near 

 margins, outer surface of leaf \ery porose, pores strongly ringed near apex: 

 dioicous, rarely monoicous: perichaetial leaves large, ovate, above abruptly 

 contracted to a narrow truncate emarginate involute point; hyaline cells 



