Fungalpedia – Note 271, Alloanthostomella

 

Alloanthostomella Daranag., Camporesi & K.D. Hyde

Citation when using this entry: Perera et al. 2024 (in prep) – Fungalpedia, genera described in 2016.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

Classification: Incertae sedis, Xylariales, Xylariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi

Daranagama et al. (2016) established the monotypic genus Alloanthostomella to accommodate Anthostomella rubicola, based on the phylogenetic analysis of ITS, LSU, rpb2 and tub2 molecular markers. The recognition of A. rubicola as a separate genus by Daranagama et al. (2016) was not supported by the analyses by Voglmayr et al. (2018), as it was clustered within the Anthostomella clade. Daranagama et al. (2018) treated Alloanthostomella in Hypoxylaceae owing to its close phylogenetic affinity to core hypoxyloid species. However, the genus was transferred to Xylariales incertae sedis by Samarakoon et al. (2022) based on the combined ITS-LSU-rpb2–tub2–tef1 phylogenies. Alloanthostomella rubicola is saprobic on Cornus sanguinea and Rubus (Daranagama et al. 2016). Alloanthostomella is the only anthostomella-like genus shown to have hyaline ascospores (Daranagama et al. 2016). The sexual morph of this genus is characterized by immersed, scattered, black ascomata with slightly raised conical areas. They are solitary or sometimes aggregated into globose clusters with a disc-like, central, black ostiolar dot. The carbonaceous clypeus consisted of intracellular fungal hyphae and host tissues. The peridium is composed of a few compacted cell layers, with thick-walled, light to dark brown cells of textura irregularis on the outside and thin-walled, hyaline cells of textura angularis on the inside. The paraphyses are sparse, filamentous, and septate. Asci are 8-spored, unitunicate, cylindrical, short-pedicellate, apically rounded, and have wedge-shaped-cylindrical, J+, apical ring. Ascospores are overlapping uniseriate-biseriate, elongate-ellipsoidal with one tapered and pointed end, smooth-walled, and remain hyaline in the asci. They are bicellular, with a rostrate, hyaline, dwarf cell, and a hyaline or occasionally dark brown larger cell (Daranagama et al. 2016). However, the asexual morph remains undetermined.

The type species Alloanthostomella rubicola (Speg. ex Sacc. & Trotter) Daranag., Camporesi & K.D. Hyde

Other accepted species: This genus in monotypic

 

 

 

Figure 1 – Alloanthostomella rubicola (MFLU 15-0661, reference specimen). a Pseudostroma on host. b Cross section of ascoma. c Peridium. d Paraphyses. e Asci. f Ascospores. Scale bars: a = 500 μm, b = 100 μm, c = 30 μm, d–f = 10 μm. Redrawn from Daranagama et al. (2016).

 

References

Daranagama DA, Camporesi E, Jeewon R, Liu X, Stadler M, Lumyong S, Hyde KD. 2016 – Taxonomic rearrangement of Anthostomella (Xylariaceae) based on a multigene phylogeny and morphology. Cryptogamie, Mycologie 37, 509–538.

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, 1–65.

Samarakoon MC, Hyde KD, Maharachchikumbura SS, Stadler M et al. 2022 – Taxonomy, phylogeny, molecular dating and ancestral state reconstruction of Xylariomycetidae (Sordariomycetes). Fungal Diversity 112, 1–88.

Voglmayr H, Friebes G, Gardiennet A, Jaklitsch WM. 2018 – Barrmaelia and Entosordaria in Barrmaeliaceae (fam. nov., Xylariales) and critical notes on anthostomella-like genera based on multigene phylogenies. Mycological Progress 17, 155–177.

 

Entry by

Rekhani Hansika Perera, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand.

 

(Edited by Kevin D. Hyde, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

 

Published online 28 May 2024

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