Additions to Dendrodacrys and outline of taxa with branched hyphidia in Dacrymycetes (Basidiomycota)

A Savchenko; J C Zamora; R Alvarenga; U Kõljalg; O Miettinen

doi:10.3114/fuse.2022.10.04

Additions to Dendrodacrys and outline of taxa with branched hyphidia in Dacrymycetes (Basidiomycota)

Fungal Syst Evol. 2022 Dec:10:103-126. doi: 10.3114/fuse.2022.10.04. Epub 2022 Oct 21.

Authors

A Savchenko¹, J C Zamora^{2

3}, R Alvarenga⁴, U Kõljalg^{1

5}, O Miettinen⁶

Affiliations

¹ Institute of Ecology and Earth Sciences, University of Tartu, J. Liivi 2, 50409, Tartu, Estonia.
² Museum of Evolution, Uppsala University, Norbyvägen 16, SE-75236, Uppsala, Sweden.
³ Conservatoire et Jardin Botaniques de la Ville de Genève, Chemin de l'Impératrice 1, 1292 Chambésy-Genève, Switzerland.
⁴ Departamento de Micologia, Centro de Biociências, Universidade Federal de Pernambuco, Avenida da Engenharia, S/N 50740-600 - Cidade Universitária, Recife, Pernambuco, Brazil.
⁵ Natural History Museum, University of Tartu, Vanemuise 46, 51003, Tartu, Estonia.
⁶ Finnish Museum of Natural History, University of Helsinki, P.O. Box 7, FI-00014, Helsinki, Finland.

Abstract

The genus Dendrodacrys is a monophyletic group that belongs to Dacrymycetes (Agaricomycotina, Basidiomycota) and accommodates species distinguished by strongly branched hyphidia in combination with 3-septate basidiospores. While the original circumscription mainly treated European taxa, here we shift the focus to tropical and sub-tropical material and uncover wider variation in morphology within Dendrodacrys. Still united by hyphidia shape and basidiospore septation, the genus is expanded with 10 taxa having pustulate, cerebriform, or stipitate basidiocarps of yellow to dark brown colours, cylindrical to ovoid basidiospores, and hyphal septa with or without clamps. Monophyly of the amended Dendrodacrys is confirmed with a phylogeny based on six markers (SSU, ITS, LSU, TEF1-α, RPB1, and RPB2). As a result, we describe two new species (De. laetum and De. rigoratum), transfer three existing species to Dendrodacrys (De. brasiliense, De. dendrocalami, and De. pezizoideum), and raise one variety to the species level (De. kennedyae ≡ Dacrymyces enatus var. macrosporus). In addition, we provide descriptions for the earlier combined De. paraphysatum and four new informal taxa. Lastly, we present illustrations, a character table, and an identification key that addresses all known dacrymycetes with branched hyphidia. Citation: Savchenko A, Zamora JC, Alvarenga R, Kõljalg U, Miettinen O (2022). Additions to Dendrodacrys and outline of taxa with branched hyphidia in Dacrymycetes (Basidiomycota). Fungal Systematics and Evolution 10: 103-126. doi: 10.3114/fuse.2022.10.04.

Keywords: Dacrymycetaceae; biodiversity; new taxa; systematics; tropics; type studies.