Fungalpedia – Note 509, Operculomycetaceae

 

Operculomycetaceae Doweld

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

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

Classification: Rhizophydiales, Rhizophydiomycetes, Chytridiomycotina, Chytridiomycota, Chytridiomyceta, Fungi.

Doweld (2014) introduced the family Operculomycetaceae in Rhizophydiales to accommodate Operculomyces. Powell et al. (2011) established the genus under Rhizophydiales through ITS-LSU gene based phylogenetic analyses and zoospore ultrastructure, scanning electron and light microscopic level morphology. Later, Powell et al. (2015) and Letcher et al. (2015) represented Operculomycetaceae on phylogenetic tree while proposing new families and genus under Rhizophydiales. Members of this family have monocentric and eucarpic thallus with extensively branched rhizoids commonly arising from a single main axis. Sporangia is apically operculate. Zoospores are spherical and posteriorly uniflagellate, with a prominent multilayered J-shaped laminated spur curving over the anterior end of the kinetosome. kinetosomes and non-flagellated centrioles are at acute (15-20º) angle. They lack microtubule roots and fenestrated cisternae and are saprophytic on keratin, chitin, and pollen (Doweld 2014).

Type genus: Operculomyces M.J. Powell, Letcher & Longcore 

Other accepted species: Species Fungorum – search Operculomycetaceae

 

Figure 1 –  Operculomyces laminatus. a, b Developing thallus. c Two thalli growing on keratin with an opened, large discharge pore. d Attached operculum and smooth edge of discharge pore. Redrawn from Powell et al. (2011).

 

References 

Doweld AB. 2014 – Nomenclatural novelties. Operculomycetaceae. Index fungorum 118, 1.

Letcher PM, Powell MJ, Davis WJ. 2015 – A new family and four new genera in Rhizophydiales (Chytridiomycota). Mycologia 107(4), 808–830.

Liu XY, Zheng RY. 2015 – New taxa of Ambomucor (Mucorales, Mucoromycotina) from China. Mycotaxon 130(1), 165–171.

Powell MJ, Letcher PM, Chambers JG, Roychoudhury S. 2015 – A new genus and family for the misclassified chytrid, Rhizophlyctis harderi. Mycologia 107(2), 419–431.

Powell MJ, Letcher PM, Longcore JE. 2011 – Operculomyces is a new genus in the order Rhizophydiales. Mycologia 103(4), 854–862.

 

Entry by 

Sruthi OP, National Fungal Culture Collection of India (NFCCI), Biodiversity and Palaeobiology Group, MACS Agharkar Research Institute, G.G. Agarkar Road, Pune 411004, India.

 

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

 

Published online 9 December 2024

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