Pleosporales » Pleosporaceae


Extrawettsteinina M.E. Barr, Contr. Univ. Mich. Herb. 9(8): 538 (1972).

Index Fungorum number: IF 1967; Facesoffungi number: FoF 00520, 2 morphological species (Species Fungorum, 2022), molecular data unavailable.

Saprobic on dead leaves and wood. Sexual morph: Ascomata scattered, erumpent to superficial, globose or conical, dark brown to black, carbonaceous. Papilla black, with a porelike ostioles, ostiolar canal filled with periphyses. Peridium a single layer composed of compressed, thick-walled cells, fusing with the host at the outside. Hamathecium of dense broad, cellular pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical, apex rounded with and a minute ocular chamber with short pedicel. Ascospores uniseriate, slightly overlapping, ellipsoid, obovate-clavate, 3-septate, slightly to not constricted at the septum, wall smooth. Asexual morph: undetermined (Adapted from Ariyawansa et al., 2014).


Type species: Extrawettsteinina minuta M.E. Barr


Notes: Extrawettsteinina is characterised by scattered, erumpent to superficial, globose or conical, dark brown to black, carbonaceous ascomata, fissitunicate, cylindrical asci, and ellipsoid, obovate-clavate, 3-septate ascospores. The diagnostic morphological character of Extrawettsteinina is the conic superficial ascomata and radiating arrangement of wall cells. Extrawettsteinina pinastri was treated as a synonym of Kriegeriella mirabilis based on morphology and was included in the section of Kriegeriella (Arx & Müller 1975, Barr 1975). Barr (1987b) introduced Kriegeriellaceae (Dothideales) to accommodate Kriegeriella and Extrawettsteinina but this treatment was not followed by subsequent authors. Ariyawansa et al. (2015) observed the holotype of Extrawettsteinina minuta (NY, 01103003) but could not see any ascomata in the type specimen and thus provided an updated description from another specimen of E. minuta (NY, 4278), collected from the same host and by the same collector. Ariyawansa et al. (2015) tentatively placed Extrawettsteinina in Pleosporaceae following Lumbsch and Huhndorf (2010) and Zhang et al. (2012). Extrawettsteinina is currently a distinct genus in Pleosporaceae but fresh collections with DNA sequence data are needed to confirm the taxonomic placement. Molecular data is lacking for the type species. Extrawettsteinina needs to be epitypified.


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