Stilbocrea walteri sp. nov., an unusual species of Bionectriaceae

Hermann Voglmayr,Walter M Jaklitsch

doi:10.1007/s11557-018-1427-0

Hermann Voglmayr, Walter M Jaklitsch

Open Access

https://doi.org/10.1007/s11557-018-1427-0

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Abstract

The new species Stilbocrea walteri is described and illustrated from Quercus ilex collected in Portugal. Phylogenetic analyses of LSU rDNA, rpb1, rpb2 and tef1 sequence matrices place S. walteri in the Bionectriaceae, Hypocreales, within a clade of specimens morphologically identified as Stilbocrea macrostoma, the generic type of Stilbocrea. Stilbocrea walteri differs from S. macrostoma in dark olive green to blackish ascomata basally immersed in a stroma, KOH+ and LA+ ascomata and the lack of a stilbella-like asexual morph on natural substrate and pure culture. A simple phialidic asexual morph is formed in pure culture. To enable a morphological comparison, Stilbocrea macrostoma is illustrated.

Highlights

During a collecting trip to Portugal, a black stromatic pyrenomycete was collected on dead corticated branches of Quercus ilex
The partial immersion of ascomata in a well-developed stroma and reddening of the ascomatal walls in KOH pointed towards Nectriaceae, but molecular phylogenetic analysis based on LSU rDNA, rpb1, rpb2 and tef1 sequences revealed a place
Dark stromata and/or ascomata are not typically seen in Hypocreales, they are formed by numerous nectriaceous species such as Nectria eustromatica (Jaklitsch and Voglmayr 2011b) or Thyronectria obscura (Jaklitsch and Voglmayr 2014)

Summary

Introduction

During a collecting trip to Portugal, a black stromatic pyrenomycete was collected on dead corticated branches of Quercus ilex. Microscopic analyses revealed a nectriaceous fungus, which could not be identified to genus or species, and the familial affiliation remained unclear. The partial immersion of ascomata in a well-developed stroma and reddening of the ascomatal walls in KOH pointed towards Nectriaceae, but molecular phylogenetic analysis based on LSU rDNA, rpb, rpb and tef sequences revealed a place-. This article is part of the BSpecial Issue on hyphomycete taxonomy and diversity in honour of Walter Gams who passed away in April 2017^ Section Editor: Hans-Josef Schroers and Marc Stadler

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