SPHAGNUM. 47 



the coma obtuse. Br. 1. imbricated, very broad, ovate, 

 rounded and cucullate at apex, boat-shaped, concave, 

 scarcely margined. Dioicous. 



a. Cells of bark of stem with spiral fibres and pores. 



7. S. cymbifolium, Uhr. St. 3 — 12 inches, robust, 

 tufted, solid, covered with a cortical web. Tufts 

 dirty olive-green, sometimes purplish. Bark of stem 

 of 3 or 4 strata of cells, both fibrose and porose. St. 

 1. lingulate-spathulate, with a rounded, slightly frayed 

 apex, usually without fibres or pores ; br. 1. imbricate, 

 broadly ovate, concave, cucullate and muriculate at 

 apex. Chlorophyll cells entirely enclosed by the 

 hyaline cells. Caps, large, globose, on a short seta. 

 Dioicous. 



Bogs, common. June, July. 



Var. /8. SQUAREosuLUM. Slender, dark green. Br. 1. 

 more pointed, slightly squarrose. 



Var. 7. COMPACTUM, Schultz (congestum, Schp.). 

 Densely tufted. St. green or purplish. Br. 1. suberect, 

 obtuse J St. 1. upper cells fibrose. 



b. Cells of bark of stem porose but not fibrose. 



8. S. papillosum, Lindb. Tufts ochraceous, never 

 tinged with purple. St. 1. spathulate, fringed at apex, 

 basal cells large, empty, upper with a few fibres and 

 pores. Br. 1. broadly ovate obtuse, cucullate, concave, 

 papillose at apex j chl. cells enclosed in hyaline, ellip- 

 tical, and the latter covered internally, where uniting 

 with former, with fine papillae ; lower cells of pedun- 

 cular bracts, in centre thick- walled, empty ; marginal 

 and upper cells porose and fibrose. 



Subalpine peat bogs, frequent. 



Var. yS. coni'BETUM. Tufts short, dense. Bark cells 

 of St. usually non-fibrose. Br. 1. very concave, obtuse. 



