Reassessment ofAllantonectria, phylogenetic position ofThyronectroidea, andThyronectria caraganaesp. nov.
The genusAllantonectriais synonymised withThyronectria, based on morphological and molecular phylogenetic considerations. Investigations of types and fresh collections revealed thatTubercularia concentricais an earlier name forSphaeria(syn.Allantonectria)miltinaand is thus combined inThyronectria.Allantonectria yuccaeis recognised as a distinct species and transferred toThyronectria, as well as the recently describedA. zangii. Descriptions and illustrations are provided forT. concentricaandT. yuccae. A recent collection of the North AmericanThyronectroidea chrysogramma, the generic type ofThyronectroidea, was studied with respect to morphology of its sexual morph in fresh condition and of its asexual morph produced in pure culture. Molecular phylogenies based on six loci (ITS and LSU regions of nuc rDNA,act1,rpb1,rpb2,tef1andtub2genes) placeT. chrysogrammawithinThyronectria, confirming synonymy ofThyronectroideawithThyronectria, but remarkably a relationship to European species with green to brown spores (former genusMattirolia) receives no support, and its closest relatives remain unclear.Thyronectria caraganaeis described as a new species from herbarium specimens ofCaragana arborescenscollected in the Ukraine. It is characterised by morphology of the sexual morph and by DNA sequence data, which place it within theT. austroamericana-T. rhodochloraclade with high support. This is also supported by its morphology, specifically ascomata partly embedded within a stroma, muriform ascospores not budding within the ascus, becoming yellowish to rosy at maturity.
Division of Systematic and Evolutionary Botany, Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Wien, Austria.
Hermann
H
Voglmayr
V. N. Karazin Kharkiv National University, Maidan Svobody 4, 61022 Kharkiv, Ukraine.
Olexander Yu
OY
Akulov
Division of Systematic and Evolutionary Botany, Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030 Wien, Austria; Institute of Forest Entomology, Forest Pathology and Forest Protection, Department of Forest and Soil Sciences, BOKU-University of Natural Resources and Life Sciences, Hasenauerstraße 38, 1190 Wien, Austria.
Walter M
WM
Jaklitsch
Ascomycota; Hypocreales; Nectriaceae; Phylogenetic analysis; Sordariomycetes; Taxonomy