Publications by authors named "Jason M Karakehian"

2 Publications

  • Page 1 of 1

Placement of Triblidiaceae in Rhytismatales and comments on unique ascospore morphologies in Leotiomycetes (Fungi, Ascomycota).

MycoKeys 2019 18;54:99-133. Epub 2019 Jun 18.

Farlow Herbarium of Harvard University, 22 Divinity Avenue, Cambridge, MA, 02138, USA Harvard University Cambridge United States of America.

Triblidiaceae is a family of uncommonly encountered, non-lichenized discomycetes. A recent classification circumscribed the family to include (4 spp. and 1 subsp.), (2 spp.) and (2 spp. and 1 var.). The apothecia of these fungi are persistent and drought-tolerant; they possess stromatic, highly melanized covering layers that open and close with fluctuations of humidity. Triblidialean fungi occur primarily on the bark of , Pinaceae and Ericaceae, presumably as saprobes. Though the type species of is from China, these fungi are mostly known from collections originating from Western Hemisphere temperate and boreal forests. The higher-rank classification of triblidialean fungi has been in flux due in part to an overemphasis on ascospore morphology. Muriform ascospores are observed in species of and in . An intense, dark blue/purple ascospore wall reaction in iodine-based reagents is observed in species of . These morphologies have led, in part, to these genera being shuffled among unrelated taxa in Hysteriaceae (Dothideomycetes, Hysteriales) and Graphidaceae (Lecanoromycetes, Ostropales). Triblidiaceae has been placed within the monofamilial order Triblidiales (affinity Lecanoromycetes). Here, we demonstrate with a three-gene phylogenetic approach that triblidialean fungi are related to taxa in Rhytismatales (Leotiomycetes). We synonymize Triblidiales under Rhytismatales and emend Triblidiaceae to include and , with placed within Rhytismataceae. A history of Triblidiaceae is provided along with a description of the emended family. We discuss how the inclusion of triblidialean fungi in Rhytismatales brings some rarely observed or even unique ascospore morphologies to the order and to Leotiomycetes.
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http://dx.doi.org/10.3897/mycokeys.54.35697DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6592975PMC
June 2019

Placement of the genus Angelina within Rhytismatales and observations of Angelina rufescens.

Mycologia 2014 Jan-Feb;106(1):154-62

Farlow Herbarium of Harvard University, 22 Divinity Avenue, Cambridge, Massachusetts 02138.

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.
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http://dx.doi.org/10.3852/13-174DOI Listing
April 2014