Hymenochaetales: a molecular phylogeny for the hymenochaetoid clade

Abstract

The hymenochaetoid clade is dominated by wood-decaying species previously classified in the artificial families Corticiaceae, Polyporaceae and Stereaceae. The majority of these species cause a white rot. The polypore Bridgeoporus and several corticicoid species with inconspicuous basidiomata live in association with brown-rotted wood, but their nutritional strategy is not known. Mycorrhizal habit is reported for Coltricia perennis but needs confirmttion. A surprising element in the hymenochaetoid clade is a group of small white to brightly pigmented agarics earlier classified in Omphalina. They form a subclade together with some similarly colored stipitate stereoid and corticioid species. Several are associated with living mosses or one-celled green algae. Hyphoderma pratermissum and some related corticioid species have specialized organs for trapping and killing nematodes as a source of nitrogen. There are no unequivocal morphological synapomorphies known for the hymenochaetoid clade. However almost all species examined ultrastructurally have dolipore septa with continuous parenthesomes while perforate parenthesomes is the normal condition for other homobasidiomycete clades. The agaricoid Hymenochaetales have not been examined. Within Hymenochaetales the Hymenochaetaceae forms a distinct clade but unfortunately all morphological characters supporting Hymenochaetaceae also are found in species outside the clade. Other subclades recovered by the molecular phylogenetic analyses are less uniform, and the overall resolution within the nuclear LSU tree presented here is still unsatisfactory.

Species of Hymenochaete (Hymenochaetales, Basidiomycota) on bamboos from East Asia, with descriptions of two new species

“…As shown in previous studies (Larsson et al 2006, He and Dai 2012, He and Li 2013, Parmasto et al 2014, species of Hymenochaetopsis formed a highly supported clade in our phylogenetic tree (Fig. 1).…”

“…Wagner and Fisher (2002) separated the genus Pseudochaete T. Wagner & M. Fisch. from Hymenochaete according to phylogenetic analyses of nuclear large subunit ribosomal DNA sequences. Subsequently, this separation was supported by several molecular studies, and more species were described in or transferred to Pseudochaete (Larsson et al 2006, He and Dai 2012, He and Li 2013, Parmasto et al 2014. Yang et al (2016) proposed Hymenochaetopsis S.H.…”

A new cystidiate variety of Omphalina pyxidata (Basidiomycota, tricholomatoid clade) from Italy

“…Morphologically, our new taxon resembles the omphalinoid bryophilous genera belonging to the hymenochaetoid clade (Redhead et al 2002b, Antonín & Noordeloos 2004. However, Rickenella differs in having a regular hymenophoral trama (Contu 1997, Redhead et al 2002b and Blasiphalia by growing specifically on the Blasia pusilla gametophyte (Marchantiophyta) and forming appressoria on host surface (Larsson et al 2006). Apart from molecular data that clearly support our new variety within the Agaricales, morphologically Contumyces (= Jacobia Contu, nom.…”

A revised checklist of corticioid and hydnoid fungi in China for 2010

“…Based on the modern taxonomy, most species in the orders of Corticiales, Trechisporales and Atheliales can be cathegorized as corticioid fungi; however, some corticioid species are treated in the orders of Polyporales, Hymenochaetales, Gloeophyllales, Thelephorales, Cantharellales, Russulales, Agaricales and Auriculariales (Hjortstam et al 1988;Ginns and Lefebvre 1993;Hjortstam 1997;Ginns 1998;Larsson et al 2006;Kirk et al 2008). Around 1,100 corticioid fungal species have been recorded in some main reports (Maekawa 1993;Hjortstam 1997;Hansen and Knudsen 1997;Ginns 1998;Wu 2000;Kotiranta et al 2009), and 8,663 names of corticioid fungi were included in Cortbase Version 2.1 (December 2009, http://andromeda.botinst.gu.se/cortbase.html).…”