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Abstract Detail


Karakehian, Jason [1], Miller, Andrew N. [2].

A phylogeny of propoloid fungi in the Marthamycetales (Ascomycota, Leotiomycetes.

Saprobic fungi that inhabit dead, suspended wood are adapted to a harsh environment. Suspended, dead limbs and branches are not only nutrient-poor, but they are often desiccated and exposed to ultraviolet radiation and wind. Many unrelated groups of fungi that exploit this niche possess suites of convergently evolved morphological and physiological traits. One such group of morphologically similar fungi, colloquially termed "propoloid fungi," consist of nine genera that are currently classified in Marthamycetales. These produce distinctive, erumpent apothecia in culms (Phragmiticola), leaves (Cyclaneusma, Marthamyces, Naemacyclus, Ramomarthamyces) and woody tissues (Naemacyclus, Propolina, Propolis, Mellitiosporiella, Mellitiosporium). The taxonomy and life-histories of most members of this order are poorly understood. For example, endophytic states are speculated in two genera, and an asexual state is known from only one species. Notably, there has never been a comprehensive taxonomic revision of any of the genera of lignicolous propoloid fungi in Propolina, Propolis, Mellitiosporiella, or Mellitiosporium. No representative gene sequences of these four genera or Phragmiticola have been included in phylogenetic analyses. In this research, evolutionary relationships among representatives of all nine genera of propoloid fungi were estimated using a multi-locus phylogenetic approach. A dataset consisting of ITS, LSU, mtSSU, β-tubulin, TEF, RPB2, and Mcm7 was assembled after Sanger sequencing, concatenated, and analyzed by maximum likelihood using IQ-TREE 2 and by Bayesian using MrBayes. Supra-ordinal evolutionary relationships of Marthamycetales within Leotiomycetes were not elucidated due to lack of support. Propolina is a synonym of Propolis, while Phragmiticola and Mellitiosporium are members of Helotiales (Leotiomycetes) and Ostropales (Lecanoromycetes), respectively. The remaining genera of Marthamycetales are divided into two well-supported monophyletic groups that represent two families: one of the filiform-spored genera Cyclaneusama, Marthamyces, Naemacyclus, and Ramomarthamyces, and the other of the allantoid-/elliptical-spored genera Propolis and Mellitiosporiella. The familial name Propolidaceae nom. prov. is proposed to circumscribe these two genera. This restricted circumscription of Marthamycetales provides a clarified taxonomic framework with which to approach a revision of the order.

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1 - University of Illinois Urbana-Champaign, Department of Plant Biology/Illinois Natural History Survey, Forbes Natural History Building, 1816 S. Oak St., Champaign, IL, 61820, USA
2 - University of Illinois Urbana-Champaign, Illinois Natural History Survey, 1816 S. Oak St., Champaign, IL, 61820, USA

saprotrophic fungi
Fungal diversity

Presentation Type: Poster
Session: MYP1, Mycology Posters I
Location: /
Date: Monday, July 19th, 2021
Time: 5:00 PM(EDT)
Number: MYP1018
Abstract ID:1135
Candidate for Awards:MSA Best Poster Presentation Award by a Graduate Student

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