Fungalpedia – Note 2042, Racodiaceae

 

Racodiaceae. Link.

Citation when using this data: Hongsanan S et al. 2020 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank

Classification: Racodiales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

 

On inclined to vertical siliceous rocks in recesses. Hyphae vertically arranged, lacking interlocking corrugations, lacking lateral spines, thick-walled, fused to form elongated rectangular cells, vertically orientated cells along the axis of the algal filament, overall smooth, rather than a knobby appearance, completely smooth in SEM. 

Notes – Racodiaceae was introduced with a single genus. Members of this family are found on inclined to vertical siliceous rocks in recesses where it is cool with no direct rain, but high humidity, and with a temperate/subboreal distribution (Hawksworth et al. 2011, Nimis et al. 2018). Phylogenetic analyses based on the type species Racodium rupestre showed that it forms a distinct clade as genus incertae sedis in Capnodiales (Muggia et al. 2008), and the same result was shown by Crous et al. (2009c) and Ruibal et al. (2009). Racodiaceae was mentioned again to accommodate Racodium in Lücking et al. (2017) and Wijayawardene et al. (2017a). This family is poorly studied. We provide a drawing to show its morphology

 

Type genus: Racodium Fr., Systema Mycologicum 3(1): 229 (1829).

Other accepted species: Species Fungorum – search Racodiaceae.

 

References

Crous PW, Schoch CL, Hyde KD, Wood AR et al. 2009c – Phylogenetic lineages in the Capnodiales. Studies in Mycology 64, 17–47.

Hawksworth DL, Santesson R, Tibell L. 2011 – Racoleus, a new genus of sterile filamentous lichen-forming fungi from the tropics, with observations on the nomenclature and typification of Cystocoleus and Racodium. IMA Fungus 2, 71–79.

Lücking R, Hodkinson BP, Leavitt SD. 2017 – The 2016 classification of lichenized fungi in the Ascomycota and Basidiomycota-approaching one thousand genera. Bryologist 119,

Muggia L, Hafellner J, Wirtz N, Hawksworth DL, Grube M. 2008 – The sterile microfilamentous lichenized fungi Cystocoleus ebeneus and Racodium rupestre are relatives of plant pathogens and clinically important dothidealean fungi. Mycological Research 112, 50–56.

Nimis PL, Hafellner J, Roux C, Clerc P et al. 2018 – The lichens of the Alps–an annotated checklist. MycoKeys 31, 1–634.

Ruibal C, Gueidan C, Selbmann L, Gorbushina AA et al. 2009 – Phylogeny of rock-inhabiting fungi related to Dothideomycetes. Studies in Mycology 64, 123–133.

Wijayawardene NN, Hyde KD, Rajeshkumar KC, Hawksworth DL et al. 2017a – Notes for genera: Ascomycota. Fungal Diversity 86, 1–594.

 

Entry by

Sinang Hongsanan, Guangdong Provincial Key Laboratory for Plant Epigenetics, Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People’s Republic of China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50002, Thailand

 

Published online 23 March 2026

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