Dothideomycetes families incertae sedis » Polystomellaceae

Dermatodothella

Dermatodothella Viégas, Bragantia 4(1–6): 150 (1944).

Index Fungorum number: IF 1472; Facesoffungi number: FoF 06492, 1 morphological species (Species Fungorum 2022), no molecular data available.

Parasitic on leaves in terrestrial habitats. Sexual morph: Ascostromata superficial to semi-immersed, globose to subglobose, with two to numerous locules. Locules globose to subglobose, with individual central ostioles. Ostioles usually widely porate, with well-developed neck, ostiolar canal filled with periphyses. Peridium of locules thin-walled, heavily pigmented, small, dark brown to black cells of textura angularis. Hamathecium composed of filiform pseudoparaphyses. Asci 8-spored, fissitunicate, clavate to sub-cylindrical, with a short, broad, furcate pedicel with an ocular chamber. Ascospores 2–3 overlapping seriate, fusoid with broadly rounded ends, hyaline,uniseptate, constricted at the septa when immature. Asexual morph: unknown (adapted from Ariyawansa et al. 2013).

 Type species: Dermatodothella multiseptata Viégas

Notes: Dermatodothella is characterised by superficial to semi-immersed, globose to subglobose ascostromata, ostiolar canal filled with periphyses, clavate to sub-cylindrical asci and hyaline,uniseptate ascospores. Dermatodothella resembles Dothidella in having multi-loculate, globose to subglobose ascostromata, with wide porate ostioles. Dermatodothella differs from Dothidella in having filiform pseudoparaphyses and multiseptateascospores compared to the two-celled ascospores and absence of pseudoparaphyses in Dothidella (Hyde et al. 2013). Dermatodothella also resembles Munkiella in having multi-loculate ascostromata with wide porate ostioles and clavate to subcylindrical asci but differs in having superficial ascostromata and filiform pseudoparaphyses while Munkiella has semi-immersed ascostromata and cellular pseudoparaphyses. Dermatodothella differs from Parastigmatea in that the latter has immersed ascostromata enclosed by a cuticle while Dermatodothella has superficial ascostromata (Hyde et al. 2013). Ariyawansa et al. (2013) re-examined the paratype of D. multiseptata from IAC and referred Dermatodothella to Polystomellaceae based on morphological similarities with other genera in Polystomellaceae such as superficial to semi-immersed, globose to subglobose ascostromata and clavate to sub-cylindrical asci. Ariyawansa et al. (2013) however, observed only immature ascospores. Dermatodothella is a distinct genus in Polystomellaceae but lacks sequence data. Fresh collections with DNA sequence data are needed to confirm the correct taxonomic placement of the genus.

 

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