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- W2116748857 abstract "New material of Diplopteridium holdenii is described from the Drybook Sandstone assemblage of Upper Visean (Middle Mississippian) age at Puddlebrook, Gloucestershire. Vegetative leaves consist of bifurcate fronds which are pinnately divided and terminate in narrow pinnule segments. The fronds are arranged spirally in terminal crowns on a narrow, spindly axis. Fertile leaves consist of fronds which bear a median, dichotomous branchlet which gives rise to reflexed, bilaterally symmetrical cupules. One specimen demonstrates that a single fertile crown consisted of cupulate and vegetative fronds. The detailed morphology of the cupules is reconstructed from compression/impression and fusainized material from both attached and isolated units. An isotomously branched synangiate organ is also described from the locality. The synangiate organ is assigned to a new genus and species. A comparison of D. holdenii and this synangiate organ with Diplopteridium teilianum from north Wales and Sphenopteris bifida and Sphenopteris affine from northern England and Scotland, provides indirect evidence that the synangiate organ may have belonged to D. holdenii. Bifurcate and trifurcate fronds associated with dichotomous branchlets bearing either synangial or cupulate structures was a common association in the Visean compression assemblages of Great Britain." @default.
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- W2116748857 date "1988-06-01" @default.
- W2116748857 modified "2023-09-26" @default.
- W2116748857 title "New observations on the Lower Carboniferous pteridosperm Diplopteridium Walton and an associated synangiate organ" @default.
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- W2116748857 doi "https://doi.org/10.1111/j.1095-8339.1988.tb02457.x" @default.
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