Xylomelasma shoalensis A. N. Mill., Y. Marín & Stchigel

Réblová, Martina, Nekvindová, Jana, Kolařík, Miroslav, Jurjević, Željko, Kolář, Michal & Hubka, Vít, 2024, Re-evaluation of Ceratostomella and Xylomelasma with introduction of two new species (Sordariomycetes), MycoKeys 110, pp. 319-360 : 319-360

Xylomelasma shoalensis A. N. Mill., Y. Marín & Stchigel , Sydowia 68: 224. 2016.

Specimen examined.

USA – Illinois • Montgomery County, Shoal Creek Conservation Area ; 39.1871, - 89.5963; on 6 cm. diam. decorticated branch on the ground; 4 Apr 2004; A. N. Miller ANM 1 (holotype ILLS 76895 !) .

Notes.

The only available LSU sequence ( KX 290919 , Hernández-Restrepo et al. 2016) of X. shoalensis indicates that the species is a member of Ceratostomella (Fig. 1 ). Based on the sequence similarity with X. sordida (99.2 %), they are likely conspecific. However, according to its diagnosis, this species does not match the generic delimitation of Ceratostomella . Xylomelasma shoalensis was described with immersed, globose to subglobose and smaller (175–265 μm diam) ascomata featuring a rostrate, slender, non-sulcate neck and hyaline to yellowish-brown, oblong to suballantoid, septate ascospores in unitunicate asci. Its LSU sequence was not obtained from a mycelium of an axenic culture but directly from ascomata on the host. It is evident that morphology belongs to a different genus and species. We examined the holotype, but no traces of a Ceratostomella - like fungus could be found. Therefore, due to this ambiguity, X. shoalensis is excluded from Ceratostomella .

Figures

Figure 1. Maximum Likelihood phylogenetic tree of members of the Sordariomycetes based on analysis of LSU, SSU, and rpb 2 DNA sequences. Species names given in bold are taxonomic novelties; the newly acquired strains and those with novel sequences are highlighted in blue font; T, E and P denote ex-holotype, ex-epitype and ex-paratype strains: a paratype of Cryptadelphia polyseptata, b holotype of Calosphaeriophora pulchella, c holotype of Poroconiochaeta discoidea, d holotype of Coniochaetidium ostreum, e holotype of Cryptendoxyla hypophloia, f Nom. inval., Art. 36.1 (c) (Melbourne), g holotype of Jattaea prunicola, and h holotype of Diplorhinotrichum juncicola. Thickened branches indicate branch support with ML BS = 100 % and PP values = 1.0. Branch support of nodes ≥ 75 % ML and ≥ 0.95 PP is indicated above or below branches. A hyphen (–) indicates values lower than 75 % ML BS or 0.95 PP. Purple asterisk before the name indicates former members of the genus Xylomelasma within the Ceratostomella clade.