256 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



base, broadening towards middle and then narrowing into an obtuse fine 

 toothed point with involute margins, accordingly nearly lanceolate; border 

 narrow; hyaline cells mostly divided by an oblique wall, abundantly fibril- 

 lose to base, inner surface of basal half with large round ringless pores 

 in middle of cell wall, basal cells with a very large opening, in upper half 

 with single pores in the cell angles: fascicle 3-branched: branch leaves 

 ovate to oblong-ovate, apex broadly obtuse and toothed, narrowly bor- 

 dered margins broadly involute; hyaline cells on inner surface abundantly 

 fibrillose, sparingly porose on both sides, only with single pores in cell 

 angles. Hedwigia 31: 179. 1892. Mobile, Alabama. 



16. Sphagnum obesum Wils. Stern leaves large, reflexed, oblong tri- 

 angular, apex cucullate or simply obtuse, fringed, border narrow, without 

 fibrils below: branches swollen, curving downward, never twisted: leaves 

 soft and loosely placed, in water somewhat pinnately spreading, broad to 

 narrow ovate-lanceolate, broader bordered, apex several toothed, both sides 

 of apical half with small pores in almost all cell angles, especially in upper 

 and lower, rarely almost wanting. Sphagnum, contortum obesum (Wils.) 

 Limpr. Limpr. Laubm. 1: 121. New Hampshire; Massachusetts; Vir- 

 ginia; Connecticut. 



1 7. Sphagnum dasyphyllnm Warnst. Stem leaves quite large, lingu- 

 late, concave, border narrow, involute for greater part, apex cucullate, split 

 when spread out; hyaline cells below narrow and long, towards apex rhom- 

 boidal, all divided by 1 or 2 oblique walls, upper % abundantly fibrillose, 

 then a space without fibrils and again fibrillose at base; inner surface 

 rarely porose, outer surface with pores at apex only: fascicles of 2-3 spread- 

 ing and 2 pendent branches: branch leaves quite large, base narrow and 

 greatly broadened towards middle, then suddenly narrowed into a short 

 obtuse finely toothed point, accordingly round-ovate, very concave, border 

 narrow and involute to base; hyaline cells broad rhomboidal, upper half of 

 inner surface with single large pseudo-pores, outer surface with more num- 

 erous pseudo-pores and single very small strongly ringed pores in the cell 

 angles. Hedwigia 31: 176. 1892. New Haven, Connecticut. 



1 8. Sphagnum microcarpum Warnst. Stem leaves crowded, very large, 

 broad ovate, apex broadly rounded obtuse, finely toothed; margin broadly 

 involute and narrowly and equally bordered to base; hyaline cells narrow, 

 rhomboidal, abundantly fibrillose to base; pores almost wanting on inner 

 surface, outer surface with very numerous small pores in uninterrupted 

 chains along commissures, decreasing in number towards base: branches 

 single, not fasciculate: branch leaves loosely placed, quite large, ovate to 

 oblong-oval, border narrow, involute for greater part; areolation very 

 similiar to that of stem leaves. Hedwigia 30: 170. 1891. New Jersey; 

 Plorida; Alabama; Mississippi; Louisiana. 



19. Sphagnum platyphyllum Sulliv. Stems lax, quite robust, irregu- 



