Submersispora W. Dong, H. Zhang & K.D. Hyde, gen. nov.

Index Fungorum number: IF557805; Facesoffungi num- ber: FoF08719

Etymology: referring to submerged habitat of this fungus Saprobic on decaying, submerged wood in freshwater.

Sexual morph: Undetermined.

Asexual morph: Colonies broadly punctiform, gregarious or scattered or solitary, raised, black. Mycelium mostly immersed in natural substratum, consist- ing of branched, septate, thin-walled, smooth, hyaline to pale brown hyphae. Conidiophores semi-macronematous, monon- ematous, cylindrical, slender, unbranched, septate, smooth, pale brown, thin-walled. Conidiogenous cells monoblastic, holoblastic, integrated, determinate, cuneiform, pale brown, smooth. Conidia acrogenous, solitary, dry, variable in shape, septate, brown to dark black, smooth, thin-walled.

Type species: Submersispora variabilis W. Dong, H. Zhang & K.D. Hyde

Notes: – Two freshwater genera Longipedicellata and Pseu- doxylomyces are accommodated in Longipedicellataceae (Goh et al. 1997; Tanaka et al. 2015; Phukhamsakda et al. 2016; Zhang et al. 2016). Phylogenetic analyses show that our collection MFLUCC 17-2360 nests between Longipedi- cellata and Pseudoxylomyces with strong bootstrap support (Figs. 2, 68). Both Longipedicellata and Pseudoxylomyces have chlamydospore-like structures or chlamydospores (Goh et al. 1997; Phukhamsakda et al. 2016). Our collection resembles Pseudoxylomyces in having holoblastic conidioge- nous cells, but differs in having slender, semi-macronematous conidiophores and variable shaped conidia. Thus, the third freshwater genus Submersispora is introduced in this study.

Fig. 2 Phylogram generated from maximum likelihood analysis of combined LSU, 100/1.00    Periconia pseudodigitata KT 644 100/1.00    Periconia pseudodigitata KT 1195A F ITS, TEF and RPB2 sequence data for species of Dothideo- mycetes. Bootstrap values for maximum likelihood equal to or greater than 75% and Bayesian posterior probabilities equal to or greater than 0.95 are placed near the branches as ML/BYPP. Newly generated sequences are in red and ex-type strains are in bold. The new species intro- duced in this study are indicated with underline. Freshwater strains are indicated with a red letter “F”. Orders not treated in this study are compressed. The tree is rooted to Capronia pilo- sella AFTOL-ID 657 and Endo- carpon pallidulum AFTOL-ID 661 (Eurotiomycetes)

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Fig. 68 Phylogram generated from maximum likelihood analysis of combined LSU, SSU, ITS and TEF sequence data for species of Longipedi- cellataceae. Bootstrap values for maximum likelihood equal to or greater than 75% and Bayesian posterior probabilities equal to or greater than 0.95 are placed near the branches as ML/BYPP. Newly generated sequences are in red and ex-type strains are in bold. The new species intro- duced in this study are indicated with underline. Freshwater strains are indicated with a red letter “F”. The tree is rooted to Bambusicola bambusae MFLUCC11-0614 (Bambusi-colaceae)