Dothichiza
Citation: Pem D et al. (2019) Mycosphere Notes 275-324: A morphotaxonomic revision and typification of obscure Dothideomycetes genera (incertae sedis). Mycosphere 10(1), 1115–1246
Dothichiza Lib. ex Roum., Fungi Selecti Galliaei Exs.: no. 627 (1880)
Pathogenic on various substrates of a range of host plants. Sexual morph: Undetermined. Asexual morph: Conidiomata numerous in the bark, stromatic, initially in pustules covered by epidermis of the host, rupturing at the top when mature, immersed to sub-peridermal, solitary, multilocular and convoluted, often irregular in shape, dark brown to black, ostiolate. Conidiomata wall 11.2–26.6 µm wide with irregular surface at the base on the inside,outer layer composed of 2–3 layers of brown cells of textura angularis, inner layer composed of hyaline-walled cells of textura angularis. Conidiophores hyaline, branched at the base, septate, smooth, hyaline. Conidiogenous cells enteroblastic, phialidic, cylindrical, indeterminate, integrated or discrete, hyaline, smooth. Conidia cylindrical, subglobose to ovoid, or rarely ellipsoid, obtuse at apex, truncate or rounded at base, aseptate, creamy to tanny olive or pale brown, median guttulate, thick and smooth-walled.
Type species – Dothichiza populea Sacc. & Briard
Notes – The genus Dothichiza was introduced by Libert & Roumegère (1880) for the type
species D. populea, isolated from dead branches of Populus sp. Dothichiza populea was initially described and named in Saccardo & Briard (1884) who reported the fungus as a saprobe on dead branches of Populus at Troyes, France. The genus is characterized by numerous convoluted conidiomata, firstly in pustules, covered by the epidermis of the host, later rupturing at the top when mature and cylindrical, subglobose to ovoid conidia. Currently, 15 epithets are accommodated under the genus Dothichiza (Index Fungorum 2019). There is no report of a sexual morph. The genus Dothichiza shares morphological similarities to Cyclothyrium in having immersed to sub-peridermal conidiomata, a conidiomatal wall of brown cells of textura angularis, hyaline, branched conidiophores, enteroblastic, phialidic, cylindrical conidiogeneous cells and cylindrical pale brown conidia. The genus is also morphologically similar to coniothyrium-like taxa, such as Coniothyrium, Cytoplea and Microsphaeropsis (Sutton 1971, 1980, Verkley et al. 2004, 2014, de Gruyter et al. 2013). Dothichiza was previously accommodated in Dothioraceae. Cultures and sequences are available. In our phylogenetic analysis, the putative strains of Dothichiza pithyophila (dH 12609 and CBS 215.50) are segregated into 2 different subclades distant to each other; strain CBS 215.50 forms a clade close to Sydowia polyspora (CBS 162.9) in the family Dothideaceae and Dothidea pithyophila (HJ22-4, dH_12609) forms an independent lineage close to Pseudoydowia eucalypti (CPC 14927, CBS 14028) in the family Aureobasidiaceae (data not shown). We therefore, retain the genus Dothichiza in Dothideomycetes, genera incertae sedis until further confirmation.
References
De Gruyter J, Woudenberg JHC, Aveskamp AA, Verkley GJM et al. 2012 – Redisposition of phoma-like anamorphs in Pleosporales. Studies in Mycology 75, 1–36.
Hedgcock GG, Hunt NR. 1916 – Dothichiza populea in the United States. Mycologia 8(6), 300–308.
Index Fungorum. 2019 – http://www.indexfungorum.org/Names/Names.asp (Accessed 17 May 2019).
Saccardo PA. 1884 – Sylloge Fungorum: Sylloge Sphaeropsidearum et Melanconiearum. Sylloge Fungorum 3, 1–840.
Sutton BC. 1971 – Staninwardia gen. nov. (Melanconiales) on Eucalyptus. Transactions of the British Mycological Society 57 (3), 539–542.
Sutton BC. 1980 – The Coelomycetes. Fungi imperfecti with pycnidia, acervuli and stromata. Wallingford: CABI Publishing 1–696.
Verkley GJM, da Silva M, Wicklow DT, Crous PW. 2004 – Paraconiothyrium, a new genus to accommodate the mycoparasite Coniothyrium minitans, anamorphs of Paraphaeosphaeria, and four new species. Studies in Mycology 50, 323–335.
Verkley GJM, Dukik K, Renfurm R, Goker M, Stielow JB. 2014 – Novel genera of coniothyrium-like fungi in Montagnulaceae (Ascomycota). Persoonia 32, 25–51.
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