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. 2023 Apr 20:96:173-191.
doi: 10.3897/mycokeys.96.100743. eCollection 2023.

Taxonomy and phylogeny of Sidera (Hymenochaetales, Rickenella clade) from China and North America revealing two new species

Zhan-Bo Liu  1 , Hong-Min Zhou  1 , Hong-Gao Liu  2 , Yuan Yuan  1
Affiliations

Taxonomy and phylogeny of Sidera (Hymenochaetales, Rickenella clade) from China and North America revealing two new species

Zhan-Bo Liu et al. MycoKeys. .

Abstract

Sidera, belonging to the Rickenella clade of Hymenochaetales, is a worldwide genus with mostly poroid hymenophore of wood-inhabiting fungi. Two new species in the genus, Sideraamericana and S.borealis, are described and illustrated from China and North America based on morphological and molecular evidence. They were mainly found growing on rotten wood of Abies, Picea and Pinus. S.americana is characterized by annual, resupinate basidiomata with silk sheen when dry, round pores (9-11 per mm), a dimitic hyphal system, and allantoid basidiospores measuring 3.5-4.2 × 1 μm. S.borealis is characterized by annual, resupinate basidiomata with cream to pinkish buff dry pore surface, angular pores (6-7 per mm), a dimitic hyphal system, and allantoid basidiospores measuring 3.9-4.1 × 1-1.1 μm. Phylogenetic analysis based on a combined 2-locus dataset [ITS1-5.8S-ITS2 (ITS) + nuclear large subunit RNA (nLSU)] shows that the two species are members of Sidera, and they are compared with morphologically similar and phylogenetically related species, respectively. An identification key to 18 accepted species of Sidera in worldwide is provided.

Keywords: Phylogenetic analysis; polypore; wood-rotting fungi.

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Figures

Figure 1.
Figure 1.
Phylogeny of Sidera and other genera in the Rickenella clade generated by ML analyses based on combined ITS+nLSU sequences A the Rickenella clade B the genus Sidera in modena C the genus Resinicium in purple D the genus Skvortzovia in red. Branches are labelled with Maximum Likelihood bootstrap > 70%, parsimony bootstrap proportions > 50%, and Bayesian Posterior Probabilities > 0.95, respectively. New species are indicated in bold. * Newly generated sequences for this study.
Figure 2.
Figure 2.
Basidiomata of Sideraamericana (Holotype, Dai 12730). Photo by: Zhan-Bo Liu.
Figure 3.
Figure 3.
Microscopic structures of Sideraamericana (Holotype, Dai 12730) a basidiospores b basidia and basidioles c cystidioles d hyphae from subiculum e hyphae from trama f hyphae at dissepiment edge. Drawings by: Hong-Min Zhou.
Figure 4.
Figure 4.
Basidiomata of Sideraborealis (Paratypes) A Dai 24120 B Dai 22822 C Dai 23960 D Dai 24187. Photo by: Yu-Cheng Dai.
Figure 5.
Figure 5.
Microscopic structures of Sideraborealis (Holotype, Cui 11216) a basidiospores b basidia and basidioles c cystidioles d hyphae from subiculum e hyphae from trama f hyphae at dissepiment edge. Drawings by: Hong-Min Zhou.
Figure 6.
Figure 6.
Basidiomata of SideratibeticaA Dai 22321 B Dai 22639 C Dai 22663 D Dai 22151 E Dai 20342 F Dai 23407 G Dai 23486 H Dai 23648 (Holotype) I Dai 21057. Photo by: Yu-Cheng Dai.
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