Xenostigmina Crous, Mycol. Mem. 21: 154 (1998).

MycoBank number: MB 27785; Index Fungorum number: IF 27785; Facesoffungi number: FoF 00781; 2 morphological species (Hashimoto et al. 2017a), 2 species with molecular data.

Type species – Xenostigmina zilleri (A. Funk) Crous, Mycol. Mem. 21: 155 (1998).

≡ Stigmina zilleri A. Funk, Can. J. Bot. 65(3): 482 (1987).

Notes – Xenostigmina causes brown spot disease in Acer macrophyllum (Funk 1986). It is characterized by sporodochial, conidiomata, verruculose, brown, 1–3-septate conidiophores, verruculose conidiogenous cells and broadly ellipsoidal to obclavate or subcylindrical, muriform, verruculose conidia (Funk 1986, Crous 1998, Tian et al. 2015, Hashimoto et al. 2017a). Crous (1998) revealed that Xenostigmina with its Mycopappus synanamorph is distinct from Stigmina sensu stricto, which has not been shown to reside in Pseudocercospora, but appears to be related to Seifertia (Seifert et al. 2007) in the Dothideomycetes (Crous et al. 2009a). Based on phylogenetic studies, Phookamsak et al. (2014c) and Tian et al. (2015) proposed to include Xenostigmina in Melanommataceae. Hashimoto et al. (2017a) proposed to include two species X. zilleri and a new combination Xenostigmina aceris in Pseudodidymellaceae based on mycopappus-like propagules and phylogenetic analysis. The present multi-gene analysis indicated that Xenostigmina zilleri (CBS 115685) is related to Petrakia echinata (HB 090918.1) and formed a single clade in Melanommataceae (Fig. 109). Thus, Xenostigmina is retained in Melanommataceae.

Figure 109 – Phylogram generated from maximum likelihood analysis (RAxML) of genera in Melanommataceae based on ITS, LSU, and SSU sequence data. Maximum likelihood bootstrap values equal or above 70 %, Bayesian posterior probabilities equal or above 0.90 (MLBS/PP) are given at the nodes. An original isolate number is noted after the species name. The tree is rooted to Amniculicola parva (CBS 123092). The ex-type strains are indicated in bold. Hyphen (-) represents support values below 70 % MLBS and 0.90 PP.

Species

  • Xenostigmina zilleri