Dothideomycetes » Pseudoperisporiaceae


Nematostoma Syd. & P. Syd., Annls mycol. 12(2): 161 (1914).

Index Fungorum number: IF 3443; Facesoffungi number: FoF 07906, 17 morphological species (Species Fungorum 2022), no molecular data available.

Parasitic on living leaves. Sexual morph: Ascomata superficial, globose to subglobose, dark brown, with apical ostiole, surrounded by long, septate, dark brown setae, tapering to acute at the apex. Peridium comprising 2–3 layers of dark brown cells of textura angularis. Hamathecium comprising numerous cylindrical, filiform, branched, septate, anastomosed, hyaline, pseudoparaphyses. Asci 8-spored, bitunicate, cylindric-clavate, sessile or with short pedicel, apically thickened and rounded. Ascospores 2-seriate, ellipsoid to fusiform, upper part wider, slightly curved, multi-septate, constricted at the septa, hyaline to light brown, smooth-walled. Asexual morph: Unknown (adapted from Boonmee et al. 2017).

Type species: Nematostoma artemisiae Syd. & P. Syd.

Notes: Nematostoma resembles Acanthostigmella but it is a plant parasite. Arx and Müller (1975) included Nematostoma in Dimeriaceae based on its parasitic lifestyle. Barr (1997) revised and accepted Nematostoma in Pseudoperisporiaceae and this placement was followed by several authors (Kirk et al. 2008; Hyde et al. 2013) Boonmee et al. (2017) studied the type specimen N. artemisiae and retained the genus in Pseudoperisporiaceae based on its parasitic lifestyle, subiculum bearing ascomata, ostioles surrounded by long setae, bitunicate asci and 3-septate, light brown ascospores. Nematostoma is a distinct genus in Pseudoperisporiaceae. Fresh collections with DNA sequence data are needed to confirm the systematic position of Nematostoma.


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