Dothideomycetes » Dothideomycetes, genera incertae sedis

Trichodothis

Trichodothis Theiss. & Syd., Annls mycol. 12(2): 176 (1914).

 Index Fungorum number: IF 5555; Facesoffungi number: FoF 12517, 3 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic or parasitic on leaf surface of dicotyledonous. Sexual morph: Ascostromata medium-sized, solitary, scattered, or in small groups, superficial, multilocular, discoid, with straight or flexuous aggregations of hairs sticking together and forming stellate projections around the ascostroma. Locules small-sized, globose to subglobose, forming one layer within the ascostroma. Peridium one layered, lower peridium composed of light pigmented cells of textura angularis, upper peridium composed of more heavily pigmented thick-walled cells of textura angularis. Hamathecium of dense, cellular pseudo paraphyses, septate, hyaline. Asci 8-spored, bitunicate, fissitunicate dehiscence not observed, saccate, without pedicel. Ascospores 3-4-seriate, broadly ellipsoidal with broadly rounded ends, hyaline and becoming pale brown when old, uniseptate, slightly constricted at the septum. Asexual morph: Unknown (adapted from Zhang et al. 2011).

 Type species: Trichodothis comata (Berk. & Ravenel) Theiss. & Syd.

Notes: Trichodothis is characterised by superficial, multilocular, discoid ascostromata, saccate asci without a pedicel and broadly ellipsoidal with broadly rounded ends, hyaline, uniseptate ascospores (Müller & Arx 1962). Trichodothis resembles Lasiobotrys, Rhizogene and Trichodothella in having ascomata below or radially around the circumference of the stromatal disc (Müller & Arx 1962). Lumbsch and Huhndorf (2010) accepted Trichodothis in Venturiaceae. Zhang et al. (2011) examined the syntype material of T. comata (K(M): 143933) and tentatively accepted Trichodothis in Venturiales based on morphology of asci and ascospores. Hyde et al. (2013), Kirk et al. (2013) and Wijayawardene et al. (2017, 2020) referred Trichodothis to Dothideomycetes genera incertae sedis. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the generic placement of Trichodothis.

 

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