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

MycoBank number: MB 841103; Index Fungorum number: IF 841103; Facesoffungi number: FoF;

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 phial- ides; 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 al- lied to Racheliella, Oblongisporothyrium and Paratubakia, but forms a separate lineage with full support (PP = 1, ML-BS = 100%), suggesting a genus of its own.

Figure 1. Phylogram of Tubakiaceae, based on the concatenated ITS, LSU and rpb2 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 FI12007) 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, tef1 and tub2 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 FI12007) 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.