SPHAGNUM. 5 



{Papillae very small, conical ; chlorophyll cells in section oval or cuneiform 

 I*, papillosum 

 Papillae long, linear; chlorophyll cells in section broadly triangular 

 2. Austmi 



/Stem Is. widest at the broad, strongly fringed apex j 



^\Stem Is. wider at base or at middle than at apex 6 



/Stem Is. fringed at end and sides of the rounded summit 9. fimbriatum 



-'XStem Is. fringed only across the truncated apex 10. Lindbergii 



{Hyaline cells of branch Is. short, 2 or 3 times as long as wide ; retort-cells of 

 branches very large ; stem Is. rather broadly bordered .J. tenellum 

 Hyaline cells many times as long as wide ; retort-cells smaller 7 



/Stem Is. with narrow border, not or scarcely wider below 8 



'\Stem Is. with broad border, widened towards base of leaf 12 



o/Stem Is. Ungulate, very obtuse, fringed at summit 9 



\Stem Is. oval or lanceolate, more or less pointed 10 



/Stem-cuticle of 3 or 4 layers ; branch Is. recurved at apex only 7. teres 



"\Stem-cuticleof 2 layers; branch Is. recurved from middle 7*. squarrosum 



/Stem Is. faintly bordered, fibrose, coarsely toothed at apex 4. molle 



\Stem Is. strongly bordered, finely toothed or erose at apex II 



{Stem cuticle in one layer only 6. subsecu-ndum 

 Stem cuticle in 2 or 3 layers 6*- laricinum 



("Stem Is. very short, rounded, fringed at apex; branch Is. oblong, very obtuse 

 I2-| 3. rigidum 



[Stem Is. longer; branch Is. tapering to narrow points 13 



("Chlorophyll cells free on dorsal surface ; pores small ; branch Is. flattened and 



13-J undulated when dry 14 



[Chlorophyll cells free on ventral surface ; pores large 15 



/Pendent branches concealing stem ; stem-cuticle indistinct //. intermedium 



4\Pendent branches none or few ; stem-cuticle distinct 12. cuspidatuw 



{Plant reddish ; stem Is. pointed or rounded, usually toothed 8. acutifolium 

 Plant pale ; stem Is. truncate, fringed ....' 8*. Girgensohnii 



A.— Cymbifolia. 



Plants robust. Cuticular cells of stem and branches fibrose 

 and porose. Stem leaves not bordered with narrow cells. Branch 

 leaves* broadly cymbiform concave, cucullate and scabrous at 

 back of apex. Dioicous. 



1. Sphagnum cymbifolium Ehrh. (Tab. VI. A.) 



Robust. Height 6-8 inches. Pale greenish -white, fre- 

 quently with a tinge of purple. Cuticular cells of stem in 3-5 

 layers, fibrose and porose. Stem leaves broadly lingulate- 

 spathulate ; sometimes with a few fibres and pores, but usually 

 without ; broadly rounded at summit, the margin of the upper 

 part, and sometimes of the whole leaf, fimbriated from erosion of 

 the marginal cells. Divergent branches tumid, the leaves 

 broadly ovate, somewhat narrowed to the cucullate apex ; finely 



* In the descriptions of Sphagnum, the term "branch leaves" refers to those 

 of divergent branches. 



