Abstract
Angelina rufescens is placed within the core clade of Rhytismatales (Leotiomycetes, Pezizomycotina, Ascomycota) based on analysis of LSU and mtSSU rDNA. The only species in the genus, it produces distinctive ascomata that reoccur annually on wood and on the remains of its own previous fructifications, forming dense conglomerations of interlocking longitudinally elongated apothecia with gray hymenia. Known collections and references of A. rufescens indicate that it is endemic to eastern and central United States. Morphological and cultural characters are described with notes on ascomata development. No mitospores were observed in field collections or in culture. Lectotypes are designated for Hysterium rufescens and its synonym Ascobolus conglomeratus. Angelina rufescens is illustrated here for the first time in the taxonomic literature.
Highlights
A collection of Angelina rufescens (Schwein.) Duby was made in Carlisle, Massachusetts, United States 1 Apr 2012 from the underside of an oak log
The core clade was divided further into two strongly supported clades according to the plane of symmetry of the ascomata
To facilitate discussion in their study, informal designations of radiate and bilateral were assigned to the two clades. These terms describe taxa that possess circular ascomata that open in a radiate fashion, such as Coccomyces spp., and taxa in which the ascomata are elliptical or oblong and open along a single slit, such as those in Lophodermium and Hypoderma (Lantz et al 2011)
Summary
A collection of Angelina rufescens (Schwein.) Duby was made in Carlisle, Massachusetts, United States 1 Apr 2012 from the underside of an oak log. Korf identified the fungus as A. rufescens based on other material from New England provided by our colleague Lawrence Millman (Millman 2012). Korf noted that he had seen this fungus many years earlier around Ithaca, New York, and had issued it in his Discomyceteae exsiccatae as No 16 (Korf 1954). He referred us to a classic paper on this species by Durand (1902), which Korf cited in his treatment of discomycetes (Korf 1973). Subsequent morphological and sequence analyses resolved the placement of this genus not in the Dermateaceae, where Durand (1902) and Korf (1973) had placed it, but instead among the core clade of Rhytismatales (Lantz et al 2011)
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