Dothideales » Dothideaceae

Dictyodothis

Dictyodothis Theiss. & Syd., Annls mycol. 13(3/4): 346 (1915).

       Index Fungorum number: IF 1527; Facesoffungi number: FoF 00076, 8 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on dead twigs, stems and branches of land plants. Sexual morph: Ascostromata black, immersed, erumpent at maturity, aggregated or in clusters, scattered, discoid to pulvinate, globose to subglobose, coriaceous, multiloculate, with 8–10 locules, cells of ascostromata composed of several layers of dark brown to black cells of textura prismatica and textura angularis. Locules globose to subglobose, ostiolate. Hamathecium lacking pseudoparaphyses. Peridium of locules comprising light brown to brown cells of textura angularis. Asci 8-spored, bitunicate, clavate to sub-clavate or cylindrical, pedicellate, thickened with a short broad pedicel and rounded at apex, with a clear ocular chamber. Ascospores overlapping uniseriate to biseriate, yellowish brown to dark brown, muriform, with 3–6 transverse septa and 1–5 longitudinal septa, constricted at the primary septum, oblong, ovoid to fusoid, part above the central septum wider. Asexual morph: Unknown (adapted from Thambugala et al. 2014).

 

Type species: Dictyodothis berberidis (Rehm) Theiss. & Syd.

 

Notes: Dictyodothis was introduced by Theissen and Sydow (1915) and was referred to Dothideaceae. Two species with paraphyses D. acaciae and D. grewiae were added by Tilak and Kale (1969). Dictyodothis was later transferred to Pleosporaceae by von Arx and Müller (1975) based on “paraphysoids” in the locules. Dictyodothis was again referred to Dothideaceae by Barr (1987) based on the observation of Barr (1981) who reported that D. berberidis is similar to Dothidea sambuci in having “paraphysoids” walls and strands of cytoplasmic fragments of discharged asci and ascospores. Since then, Dictyodothis was treated in Dothideaceae by Lumbsch and Huhndorf (2010) and Hyde et al. (2013). Dictyodothis is characterised by erumpent, multiloculate ascostromata but is unique in having yellowish-brown, muriform ascospores. Dictyodothis is currently treated as a genus in Dothideaceae but molecular data is needed to confirm this placement.

 

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