. Bulletin of the British Museum (Natural History). . Figs 57-63 Equisetites lyellii (Mantel!). 57-59, sporangiophore heads showing radiating ridges on outer surface; 57, ; 58, ; 59, ; all x 20. 60, unmacerated portion of sporangiophore head in SEM, curved edge on right, surface ridges radiating from broken central point on left (background, heat-damaged sellotape); , x 100. 61, surface of same specimen showing cells with undulating walls very similar to rhizome cuticle; x 500. 62, 63, spore mass obtained by macerating sporangiophore head, presumed to be c
. Bulletin of the British Museum (Natural History). . Figs 57-63 Equisetites lyellii (Mantel!). 57-59, sporangiophore heads showing radiating ridges on outer surface; 57, ; 58, ; 59, ; all x 20. 60, unmacerated portion of sporangiophore head in SEM, curved edge on right, surface ridges radiating from broken central point on left (background, heat-damaged sellotape); , x 100. 61, surface of same specimen showing cells with undulating walls very similar to rhizome cuticle; x 500. 62, 63, spore mass obtained by macerating sporangiophore head, presumed to be contents of a single sporangium, ; 59, x 225; 60, x 700. There are two species, Equisetum laterale Phillips and Equise- tum bryanii Gould. Both are similar to E. lyellii in having scattered stomata and sinuous-walled epidermal cells with bars of thickening. It would be interesting to study this material again along with other Mesozoic species in the light of the phylogenetic considerations raised by the subgeneric status of E. lyellii. SPORAE DISPERSAE Genus PILASPORITES Balme & Hennelly For remarks on Pilasporites see Batten, 1968. Pilasporites aHenii Batten - Figs 64-66 1968 . Pilasporites allenii Batten: 638, pi. 123, figs 1^, 6, 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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