Phaeotubakia Ning Jiang, 2023

Jiang, Ning, Zhu, Ya-Quan, Xue, Han, Piao, Chun-Gen & Li, Yong, 2023, Phaeotubakia lithocarpicola gen. et sp. nov. (Tubakiaceae, Diaporthales) from leaf spots in China, MycoKeys 95, pp. 15-25 : 15

Phaeotubakia Ning Jiang gen. nov.

Etymology.

Named derived from phaeo (= pigmented) and its morphological similarity to Tubakia .

Type species.

Phaeotubakia lithocarpicola Y.Q. Zhu & Ning Jiang.

Description.

Sexual morph: Unknown. Asexual morph in vitro: Conidiomata sporodochial, slimy, black, semi-submerged. Conidiophores reduced to conidiogenous cells. Conidiogenous cells brown, smooth, guttulate, cylindrical to ampulliform, attenuate towards apex, phialidic. Conidia blastic, subglobose, broad ellipsoid to ellipsoid, seldom irregular, brown to dark brown, walls smooth, becoming thicker with age, base rounded or with truncate basal hilum.

Notes.

Phaeotubakia is proposed as the eleventh genus of Tubakiaceae based on morphological features and phylogeny of combined ITS, LSU, tef1 and tub2 loci (Fig. 1 ). Phaeotubakia is distinguished from Apiognomonioides , Ellipsoidisporodochium , Involutiscutellula , Oblongisporothyrium , Obovoideisporodochium , Paratubakia , Racheliella , Saprothyrium and Sphaerosporithyrium by having brown to dark brown conidia ( Braun et al. 2018; Zhang et al. 2021). Several species of Tubakia are known to have brown conidia, which is similar to Phaeotubakia lithocarpicola ( Braun et al. 2018; Zhu et al. 2022). However, they are phylogenetically distinct (Fig. 1 ).

Figures

Figure 1. Phylogram of Tubakiaceae based on combined ITS, LSU, tef 1 and tub 2 loci. Numbers above the branches indicate maximum parsimony bootstrap (MP BP ≥ 50 %), ML bootstrap values (ML-BS ≥ 50 %) and Bayesian Posterior Probabilities (BPP ≥ 0.9). The tree is rooted with Melanconis groenlandica (CBS 116540). Ex-type strains are marked with *, and strains from the present study are marked in bold blue.