The cones of Walkomiella australis (Fiest.) Florin
DOI:
https://doi.org/10.54991/jop.1981.1402Keywords:
Walkomiella, Conifers, Squamella, AraucariaceaeAbstract
Male and female cones of Walkomiella australis (Feist.) Florin is described. The large number of microsporangia borne on the scales of the male cones show a closer relationship to the male cone Squamella of the Glossopteridales or to the Cycadales than to the microsporophylls of families of conifers that exist today. They are also distinct from the arrangement found in Early Permian Lebacniaceae, or in the Voltziaceae which followed in the Late Permian, and represent a most interesting evolutionary stage in the Coniferae. Female cones have papery scales with apparently single seeds, resembling the arrangement in Araucariaceae, but they are fundamentally “tuft flowers” and once again distinct from the Lebachiaceae or the Voltziaceae.
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Feistmantel O 1890. Geological and palaeontological relations of the coal- and plant-bearing beds of Palaeozoic and Mesozoic age in eastern Australia and Tasmania with special reference to the fossil flora. Mem. geol. Surv. N.S.W. Palaeontol., 3: 1-183.
Florin R 1940. On Walkomia gen. nov., a genus of Upper Palaeozoic conifers from Gondwanaland. K. svenska Vetensk Akad. Handl., 18(5): 1-23.
Le Raox SF 1964. Walkomiella transvaalensis, a new conifer from the Middle Ecca beds of Vereeniging, Transvaal. Trans. geol. Soc. S. Afr., 66: 1-8.
Surange KR & Singh Prem 1951. Walkomiella indica, a new conifer from the Lower Gondwanas of India. J. Indian bot. Soc., 30 (1-4): 143-147.
White ME 1978. Reproductive structures of the Glossopteridales in the plant fossil collection of the Australian Museum. Rec. Aust. Mus., 31 (12): 473-505.
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