Fungalpedia – Note 352, Pseudosydowia

 

Pseudosydowia Thambug. & K.D. Hyde

Citation when using this data: Tibpromma et al. 2024 (in prep.) – Fungalpedia, Parasites.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1          

Classification: Saccotheciaceae, Dothideales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

Pseudosydowia (Saccotheciaceae) was established by Thambugala et al. (2014) and typified with Pseudosydowia eucalypti (Crous et al. 2003). The type species was described as Sphaerulina eucalypti before being transferred to Sydowia (Verwoerd et al. 1931). Sexual morph of Pseudosydowia is characterized by subepidermal, amphigenous, black, erumpent, globose ascomata, separated or aggregated in clusters, with apical ostiole. The peridium consists of several layers of dark-brown textura angularis. Eight-spored, bitunicate, fasciculate, broadly ellipsoid to clavate, straight to slightly curved asci with a well-developed ocular chamber. Ascospores are subsessile, bi- to multiseriate, septate, obovoid to ellipsoid, and have obtuse ends. In contrast, the asexual morph of Pseudosydowia is characterized by a pycnidial to avervular, amphigenous, subepidermal, dark brown conidiomata, wall comprising three to six layers of dark brown to black cells of textura angularis. Annellidic, integrated, indeterminate, annellidic, integrated, indeterminate, ampulliform to cylindrical conidiogenous cells bearing aseptate, medium brown to olivaceous-brown, ellipsoid to ovoid, aguttulate, thin-walled conidia.

Type species: Pseudosydowia eucalypti (Verwoerd & du Plessis) Thambug. & K.D. Hyde

Other accepted species: Species Fungorum – search Pseudosydowia

image

Figure 1 – Pseudosydowia eucalypti (PREM 46423). a Asci and ascospores. b Conidiophores and conidia. Scale bars: a, b = 50 μm. Redrawn from Crous et al. (2003).

 

References

Crous PW, Groenewald JZ, Wingfield MJ, Aptroot A. 2003 – The value of ascospore septation in separating Mycosphaerella from Sphaerulina in the Dothideales: a Saccardoan myth?. Sydowia-horn 55 (2), 136–152.

Thambugala KM, Ariyawansa HA, Li YM, Boonmee S, et al. 2014 – Dothideales. Fungal Diversity 68, 105–158.

Verwoerd L, du Plessis SJ 1931 – Descriptions of some new species of South African fungi and of species not previously recorded in South Africa III. South African Journal of Science 28 (07), 290–297.

 

Entry by

Yang EF, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Center for Yunnan Plateau Biological Resources Protection and Utilization, College of Biological Resource and Food Engineering, Qujing Normal University, Qujing, Yunnan 655011, China.

 

(Edited by Saowaluck Tibpromma, Samaneh Chaharmiri-Dokhaharani & Achala R. Rathnayaka)

 

Published online 14 November 2024

 

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