BARNES — NORTH AMERICAN MOSSES. 257 



larly branched, sometimes without branches; branches 1-3 in a fascicle, 

 mostly short and thick: stem and branch leaves very similar in form, stem 

 leaves large, oval to obovate, very concave, apex rounded, slightly fringed, 

 below narrowly bordered, flbrillose to base but with very small pores along 

 commissures only in upper half; branch leaves appressed, loosely placed, 

 large, very concave, ovate, rounded above, scarcely toothed, narrowly 

 bordered all around, strongly flbrillose to base, upper % of outer surface 

 with very small pores along commissures. Limpr. Laubm. 1: 122. 1890. — 

 Massachusetts; New Jersey; Virginia. 



20. Sphagnum plicatnm Warnst. — Stem leaves quite large. Ungulate, 

 upper margins frequently involute, apex hyaline margined, bordered, 

 border weak, of 4-6 rows of cells, equally broad to base; hyaline cells in 

 apical half about rhombic, in basal portion broader and longer, frequently 

 divided by one or two oblique walls, abundantly flbrillose in upper %:, pores 

 on inner surface in upper part of leaf in all cell angles, towards margins 

 more numerous; outer surface with pores in often interrupted rows along 

 commissures, towards base almost exclusively in upper cell angles: fascicles 

 mostly 4-branched, 2 spreading: leaves of spreading branches quite large, 

 ovate-lanceolate, coarsely toothed at narrowly obtuse apex, border narrow, 

 involute at apex only or sometimes farther down; hyaline cells broad, rhom- 

 boidal, not divided, pores on inner surface only in side regions, outer sur- 

 face with numerous pores in rows along commissures. Hedwigia 30: 169. 

 1891.— Granville, Mass. 



21. Sphagnum Orlandense Warnst. — Stem leaves relatively small, Ung- 

 ulate, apex rounded, scarcely toothed, not cucuUate, border narrow, involute 

 on one side nearly to base; hyaline cells generally divided by an oblique 

 wall, flbrillose to base, outer surface with small faintly ringed pores in 

 interrupted rows along commissures: fascicles mostly four-branched, 2 

 spreading: leaves of spreading branches quite large, roundish-oval, flnely 

 toothed at obtuse apex, very concave, border narrow, margins broadly in- 

 volute; hyaline cells broad rhomboidal, abundantly flbrillose, outer sur- 

 face towards apex with pores in cell angles, in middle side regions with 

 small pores in rows, outer surface with numerous pores in interrupted rows 

 along commissures. Hedwigia 31: 177. 1892. — Florida; New Jersey. 



22. Sphagnum Mobilense Warnst. — Stem leaves relatively small, Ung- 

 ulate, narrowly bordered to base, in upper half one margin sometimes in- 

 volute; hyaline cells of lower part of leaf not divided or with a single 

 oblique wall, without flbrils or only basal cells with few delicate flbrils, 

 in upper part with parallel oblique cross walls and abundantly flbrillose 

 and porose, towards apex chlorophyll cells ceasing and hyaline cells form- 

 ing a broad border which is sometimes resorbed: fascicles 4:-5-branched, 

 2 spreading: leaves of spreading branches large, round-ovate, flnely toothed 

 on scarcely obtuse apex, narrow bordered, very concave, margins broadly 



