. Bulletin of the British Museum (Natural History) Botany. 114 ALAN EDDY. Fig. 20 Sphagnum africanum Welw. & Duby. A, branch cortex; B, adaxial (left) and abaxial (right) surfaces of branch leaf; C, branch leaves; D, transverse section of stem; E, transverse section of leaf (all drawn from the type). not at all dimorphic. Stems generally rather weak, 0-3-0-6 mm diameter. Cortex mainly 1-layered but with a marked tendency towards local duplication and up to 50 per cent 2-layered, exposed cell walls without pores. Internal cylinder varying from pale yellow-brown to deep red-brown. Branch cor
. Bulletin of the British Museum (Natural History) Botany. 114 ALAN EDDY. Fig. 20 Sphagnum africanum Welw. & Duby. A, branch cortex; B, adaxial (left) and abaxial (right) surfaces of branch leaf; C, branch leaves; D, transverse section of stem; E, transverse section of leaf (all drawn from the type). not at all dimorphic. Stems generally rather weak, 0-3-0-6 mm diameter. Cortex mainly 1-layered but with a marked tendency towards local duplication and up to 50 per cent 2-layered, exposed cell walls without pores. Internal cylinder varying from pale yellow-brown to deep red-brown. Branch cortex with only slight differentiation of retort cells, most of the ordinary cortical cells having an apical pore. Stemleaves large to very large, 1-9-2-8 mm long, 1-2-1-3 mm wide, always larger than branch leaves, ovate to ovate-lingulate, widest at some distance (c. 1/4 to 1/3) above insertion, fibrillose throughout and virtually identical to branch leaves in structure. Border narrow, not widened below; apex concave and eroded. Branch leaves (l-2-)l-4- l-9(-2-l) mm, widely ovate, concave, symmetrical, erect. Border narrow, without a resorption furrow. Apex broadly rounded, eroded, sub-cucullate, never truncate-dentate. Leucocysts relatively wide (except in poorly developed plants), about 18-30 x 110-130 urn in upper mid-leaf. Abaxial surface with abundant small, ringed pores (occasionally partly replaced by pseudopores) in series along the commissures, sometimes with additional pores (ringed or unringed) in the cell midline; pores ( apertures) 2-0-4-0 urn diameter on average. Adaxial. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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