Obovoideisporodochium Z. X. Zhang, J. W. Xia & X. G. Zhang, 2021

Zhang, Zhaoxue, Mu, Taichang, Liu, Shubin, Liu, Rongyu, Zhang, Xiuguo & Xia, Jiwen, 2021, Morphological and phylogenetic analyses reveal a new genus and two new species of Tubakiaceae from China, MycoKeys 84, pp. 185-201 : 185

Obovoideisporodochium Z. X. Zhang, J. W. Xia & X. G. Zhang gen. nov.

Type species.

Obovoideisporodochium lithocarpi Z. X. Zhang, J. W. Xia & X. G. Zhang

Etymology.

Composed of “obovoideisporo-” (obovoid spores) and “-dochium” (referring to the conidioma, i.e. sporodochium).

Description.

Genus of Tubakiaceae . Living as endophyte in leaves and causing leaf spots. Asexual morph: mycelium consisting of septate, smooth and hyaline hyphae, thin-walled. Conidiomata sporodochial, appeared within 20 days or longer, formed on agar surface, slimy, pale bluish-green, semi-submerged. Sporodochial conidiophores densely and irregularly branched, bearing apical whorls of 2-3 phialides; sporodochial phialides monophialidic, subulate to subcylindrical, smooth, thin-walled, tapering towards apex, swelling at base. Conidia formed singly, obovoid to ellipsoid, smooth, thin walled, apex obtuse, base with inconspicuous to conspicuous hilum. Sexual morph: unknown.

Notes.

In the two phylogenetic trees (Figs 1 and 2 ), Obovoideisporodochium is allied to Racheliella , Oblongisporothyrium and Paratubakia , but forms a separate lineage with full support (PP = 1, ML-BS = 100%), suggesting a genus of its own.

Figures

Figure 1. Phylogram of Tubakiaceae, based on the concatenated ITS, LSU and rpb 2 sequence alignment. The BI and ML bootstrap support values above 0.74 and 74 % are shown at the first and second position, respectively. The tree is rooted to Greeneria uvicola (culture FI 12007) and ex-type cultures are indicated in bold face. Strains from the current study are in red. Some branches were shortened for layout purposes - these are indicated by two diagonal lines with the number of times a branch was shortened indicated next to the lines.

Figure 2. Phylogram of Tubakiaceae, based on the concatenated ITS, tef 1 and tub 2 sequence alignment. The BI and ML bootstrap support values above 0.74 and 74 % are shown at the first and second position, respectively. The tree is rooted to Greeneria uvicola (culture FI 12007) and ex-type cultures are indicated in bold face. Strains from the current study are in red. Some branches were shortened for layout purposes - these are indicated by two diagonal lines with the number of times a branch was shortened indicated next to the lines.