By Harris T.M.
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Extra info for The Yorkshire Jurassic flora. I. Thallophyta – Pterydophyta. London: British Museum (Natural History)
Sample text
It is less unusual than was suggested by the figures, which were upside down. The diaphragms are at their usual level about I cm. below the top of the leaf sheath, and the leaves (not stem branches) are only about I"5 cm. long, not 2·5 cm. long. The detached pieces of leaf which suggested the greater leaf length, belong to an adjacent stem. It does show one unusual feature, the leaves are distinctly reflexed at the point where they separate from the leaf sheath; and it is unusual in preservation in that the free leaves have been impregnated with iron and are solid rods.
I : , .... o ..... ,. : ·~. J:' : Fig. 8. Neocalamites hoerensis (Schimper) A, details of node. 31020, x 8. 3I026, x 1. 31025, x 8. D, node showing large scars perhaps of fallen branches. 3I024, X I. 3I02I-22, X 8. 3I023, x 25. All the specimens are from Cloughton except B which is from Haiburn Wyke. 32 THE YORKSHIRE JURASSIC FLORA as numerous, in smallest stems numbers equal. Main stems losing their leaves, medium and small stems usually retaining their leaves. Leaves of a whorl equal, typically about 12 cm.
This group includes the specimens cited under the names E. laterale and E. ferganensis in which the leaves diverge and so are often broken off. There are a few other species in which the leaves are appressed to the stem and thus well distinguished, including E. blandum Raciborski (1894), E. mobergi Moller (see Halle 1908; Moller & Halle, 1913) and E . grosphodon Harris (1931) . In the E . laterale subgroup, with spreading leaves (see synonymy) though the specimens agree closely there does seem to be some variety, for instance a few of the Asiatic specimens have distinctly oval instead of round diaphragms; and others have a rather larger hub and consequently shorter spokes.