Annellosporium nemorosum gen. et sp. nov., an annellidic anamorph with phylogenetic affinities to the genus Daldinia (Xylariales)

Authors: Davey, Marie L.
Journal: Karstenia, Volume 50 (2010), Issue 1, pages 1-10.
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Key words: Daldinia, conidiogenesis, pleomorphism, Nodulisporium, Xylariaceae

Abstract: During a survey of fungi occurring in soil from swift fox dens in a zoo enclosure in Alberta, Canada, a free-living xylariaceous mitosporic fungus was repeatedly isolated and is herein described as Annellosporium nemorosum gen. et sp. nov. The fungus is characterized by mononematous, dichotomously branched conidiophores with termini bearing groups of 1–3 cylindric, smooth to minutely roughened, enteroblastic, percurrently proliferating, annellated conidiogenous cells that produce sub-globose to obovate conidia with attenuated, flattened basal ends. Phylogenetic analysis of the ?-tubulin region indicates A. nemorosum has strong phylogenetic affinities to the teleomorphic genus Daldinia (Xylariaceae, Xylariales), and is included in a clade with those Daldinia species known to produce Nodulisporium-like anamorphs with enteroblastic conidiogenesis, rather than the holoblastic conidiogenesis typical of true Nodulisporium species. A teleomorphic state was not observed, but is expected to be Daldinia loculata-like, given the close affiliation between this species and A. nemorosum that was revealed by phylogenetic analyses of the internal transcribed spacer (ITS) region of rDNA.