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Fertile Prototaxites taiti: a basal ascomycete with inoperculate, polysporous asci lacking croziers

Honegger, R., Edwards, Dianne, Axe, Lindsey and Strullu-Derrien, C. 2018. Fertile Prototaxites taiti: a basal ascomycete with inoperculate, polysporous asci lacking croziers. Philosophical Transactions of the Royal Society B: Biological Sciences 373 (1739) , 20170146. 10.1098/rstb.2017.0146

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Abstract

The affinities of Prototaxites have been debated ever since its fossils, some attaining tree-trunk proportions, were discovered in Canadian Lower Devonian rocks in 1859. Putative assignations include conifers, red and brown algae, liverworts and fungi (some lichenised). Detailed anatomical investigation led to the reconstruction of the type species, P. logani, as a giant sporophore (basidioma) of an agaricomycete (= holobasidiomycete), but evidence for its reproduction remained elusive. Tissues associated with P. taiti in the Rhynie chert plus charcoalified fragments from southern Britain are investigated here to describe the reproductive characters and hence affinities of Prototaxites. Thin sections and peels (Pragian Rhynie chert, Aberdeenshire) were examined using light and confocal microscopy; Přídolí and Lochkovian charcoalified samples (Welsh Borderland) were liberated from the rock and examined with scanning electron microscopy. Prototaxites taiti possessed a superficial hymenium comprising an epihymenial layer, delicate septate paraphyses, inoperculate polysporic asci lacking croziers and a subhymenial layer composed predominantly of thin-walled hyphae and occasional larger hyphae. Prototaxites taiti combines features of extant Taphrinomycotina (Neolectomycetes lacking croziers) and Pezizomycotina (epihymenial layer secreted by paraphyses) but is not an ancestor of the latter. Brief consideration is given to its nutrition and potential position in the phylogeny of the Ascomycota.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Royal Society
ISSN: 0080-4622
Date of First Compliant Deposit: 17 August 2017
Date of Acceptance: 15 August 2017
Last Modified: 11 Jan 2018 19:09
URI: http://orca.cf.ac.uk/id/eprint/103687

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