Neobuelliella Hongsanan & K.D. Hyde, gen. nov.

MycoBank number: MB 557815; Index Fungorum number: IF 557815; Facesoffungi number: FoF 07615; 1 morphological species (this study), 1 species with molecular data.

Lichenicolous. Vegetative hyphae intercellular. Sexual morph: Ascomata apothecioid, dispersed over the host thallus as black dots, grouped, rarely single, rounded, globose when young, pressed at the edges, oval when mature, often bleaching the host thallus, occasionally sunken. Hymenium hyaline to brownish. Disc olive-brown, I-, KI-. Excipulum dark brown, K+ greenish-brown. Hamathecium comprising branched, anastomosing, cellular pseudoparaphyses, capitate at apical and intercalary cells with pigment, thick at tips, with dark-brown pigment. Asci 4–6-spored, bitunicate, fissitunicate cylindrical. Ascospores long, cells rounded, the upper cell sometimes tapered, hyaline, later ± brown, 1-septate, clearly constricted at the septa, thin-walled (Hafellner et al. 2008; Etayo 2010; Yazici and Etayo 2013). Asexual morph: Undetermined.

Type species: Neobuelliella poetschii (Hafellner) Hongsanan & K.D. Hyde.

Notes: The genus is introduced to accommodate Neobuelliella poetschii which was known as Buelliella poetschii. Phylogenetic analyses from Dai et al. (2018) and this study (Fig. 5) indicate that it does not cluster with the type species of Buelliella. Thus, we introduce the new genus Neobuelliella to accommodate a single species Buelliella poetschii (current name is Neobuelliella poetschii).

Fig. 5 Phylogram generated from maximum likelihood analysis (RAxML) of Asterinales based on LSU sequence data. Maximum likelihood bootstrap values equal to or greater than 70%, Bayesian posterior probabilities equal to or greater than 0.90 (MLBS/PP) are given at the nodes. Isolate numbers are noted after each species name. The tree is rooted to Venturia inaequalis (ATCC 60070) and Venturia populina (CBS 256.38). Newly sequence data generated in this study are in blue. Ex-types are indicated in bold. Hyphen (-) represents sup- port values less than 70% MLBS and 0.90 PP