Xylariales » Xylariales genera incertae sedis

Pseudoanthostomella

Pseudoanthostomella Daranag., Camporesi & K.D. Hyde, in Daranagama, Camporesi, Jeewon, Liu, Stadler, Lumyong & Hyde, Cryptog. Mycol. 37(4): 527 (2016)

Index Fungorum number: IF 552377; Facesofungi number: FoF 02531

Saprobic on dead leaves, branches, twigs and cones of Pinus. Sexual morph: Ascomata immersed to semi-immersed, developed beneath the clypeus, conical or dome shaped areas, blackened, raised, coriaceous or carbonaceous, solitary, rarely aggregated, in cross section mostly subglobose, with reduced clypeus, usually lacking a periphysate ostiolar canal. Clypeus black, thick-walled, short, comprising dark fungal hyphae and host epidermal cells. Peridium with two cell layers; outwardly comprising thick-walled, carbonaceous, compressed, dark brown cells of textura irregularis and inwardly thin-walled, hyaline cells of textura angularis. Paraphyses shorter than the asci, numerous, filamentous, septate. Asci 8-spored, unitunicate, broadly cylindrical-clavate, short-pedicellate, apically rounded, with J+ apical ring bluing in Melzer’s reagent, discoid-wedged shaped. Ascospores overlapping uniseriate, unicellular, ellipsoidal, dark brown, smooth-walled, mostly with conspicuous mucilaginous sheath, germ slit on ventral side, straight, extending over the full length, rarely absent. Asexual morph: Hyphomycetous. Conidiophores erect, arising from hyphae, complex, septate, dichotomously branched, smooth, hyaline-light brown. Conidiogenous cells monoblastic, discrete, terminal on the branches, arising in clusters of 3–4, denticulate. Conidia hyaline, elongated ellipsoidal-fusiform, sometimes curved at apical end, aseptate, unicellular, smooth-walled.

 

Type species: Pseudoanthostomella pini-nigrae Daranag., Camporesi & K.D. Hyde, in Daranagama, Camporesi, Jeewon, Liu, Stadler, Lumyong & Hyde, Cryptog. Mycol. 37(4): 530 (2016)

 

Notes: Pseudoanthostomella comprising five species was introduced to accommodate anthostomella-like species by Daranagama et al. (2016e). Pseudoanthostomella clustered in a strongly supported monophyletic clade in the phylogenetic analysis, which is similar to the previous study by Daranagama et al. (2016e). Pseudoanthostomella differs from Neoanthostomella by having asci with J+ apical ring and ascospores with germ slits. It differs from Alloanthostomella by having unicellular, pigmented ascospores with germ slits. Our phylogenetic analysis revealed that the genus has close affinities with the morphologically similar genera like Neoanthostomella. The genus is placed with other hypoxylaceous genera in this analysis, so we tentatively assign Pseudoanthostomella in Hypoxylaceae. However, in updated classification by Wijayawardene et al. (2020) assigned Pseudoanthostomella into Xylariales genera incertae sedis.

 

References:

 

Daranagama DA, Hyde KD, Sir EB, Thambugala KM et al. 2018 Towards a natural classification and backbone tree for Graphostromataceae, Hypoxylaceae, Lopadostomataceae and Xylariaceae. Fungal Diversity 88, 165.

 

Last update: 11 August 2021

 

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