Omphalina Patch Disease' and the Rickenellaceae Scott A

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AMC 2019 Oral Session 3 [Diversity, Phylogeny & Ecology of Agaricomycotina] 2-O03-3 ‘Omphalina Patch Disease' and the Rickenellaceae Scott A. Redhead, Sahra-Taylor Mullineux Ottawa Research and Development Centre, Agriculture & Agri-Food Canada, Canada Purpose: A condition resulting in vernal patches of stunted or dying cereal crops was called 'Omphalina Patch Disease' (OPD) in England after they were linked to coincidental, co-located basidiomes identified as Omphalina pyxidata. Original OPD vouchers from the 1980-90s were located in the Royal Botanic Gardens, Edinburgh, where they had been sent for identification. These were analysed both molecularly and anatomically to confirm or correct the identification. A recently published 2018 analysis on the biological status of the Hymenochaetales suggested the genus Loreleia be split between two families in two orders. In order to address this question and to resolve the generic placement of the patch fungus, an in-depth investigation was conducted to clarify the taxonomy of agaric genera in the Rickenellaceae. Methods: DNA cloning, followed by screening of the clones using higher resolution gel electrophoresis, and plasmid DNA sequencing were required to resolve the phylogenetic signatures of the old herbarium material and of the type species of Loreleia, L. postii. Results and conclusions: Neither patch disease sample is O. pyxidata (Tricholomataceae, Agaricales). Both were conspecific with each other; a species of agaric in the Rickenellaceae (Hymenochaetales). We determined that Loreleia is not split between two families and orders and that a misdetermined voucher had led to an erroneous conclusion. Additionally, Contumyces and Loreleia remain phylogenetically distinct but both require new circumscriptions. Asian Mycological Congress 2019.

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