Rhizoctonia setariae (Sawada) O’Donnell, R. P., Linde, C. C. & May, T. W., 2025

O’Donnell, R. P., Linde, C. C. & May, T. W., 2025, Rise up, Rhizoctonia: moving to one fungus, one name in the Ceratobasidiaceae (Agaricomycetes, Cantharellales), Persoonia 54 (1), pp. 285-325 : 312-313

publication ID	https://doi.org/10.3114/persoonia.2025.54.09
DOI	https://doi.org/10.5281/zenodo.16877700
persistent identifier	https://treatment.plazi.org/id/03A69C14-FF86-FF81-FCA2-F9CF668D4CEA
treatment provided by	Felipe
scientific name	Rhizoctonia setariae (Sawada)
status	comb. nov.

Treatment

Rhizoctonia setariae (Sawada) R.P. O’Donnell, C.C. Linde & T.W. May, comb. nov. MB 852080 View Materials .

Basionym: Hypochnus setariae Sawada, Bot. Mag. (Tokyo) 26: 191. 1912.

Synonyms: Ceratobasidium setariae (Sawada) Oniki et al. View in CoL , Trans. Mycol. Soc. Japan 27 (2): 153. 1986.

Sclerotium oryzae-sativae Sawada, Trans. Nat. Hist. Soc. View in CoL Formosa 9: 138. 1919.

Rhizoctonia oryzae-sativae (Sawada) Mordue, CMI Descriptions View in CoL of Pathogenic Fungi and Bacteria 41: no. 409. 1974.

Ceratorhiza oryzae-sativae (Sawada) View in CoL R.T. Moore, Antonie van Leeuwenhoek 55 (4): 394. 1989.

Ceratobasidium oryzae-sativae P.S. Gunnell View in CoL & R.K. Webster, Mycologia 79 (5): 731. 1987.

Type citation: ‘ TYPE: No type was designated and no specimens were available for study. Sawada’s illustration of H. setariae (1912) is therefore selected as a lectotype.’, as designated by Gunnell & Webster (1987). The illustration is on p. (192) and shows basidia, spores, hyphae, and a section of a sclerotium. Note that the volume of Botanical Magazine , Tokyo where the protologue appears, volume 26, has two series of pages, one for text in English and one for text in Japanese , with the latter pages given in parentheses .

ITS barcode: AF354087 View Materials ( R).

UNITE 1.5 % SH: n/a.

Alternative marker: LSU = AF354087 View Materials (sequence contains both ITS and LSU regions - R).

Notes: A type specimen for H. setariae is not extant, and the original illustration by Sawada (1912) was designated as a lectotype by Gunnell & Webster (1987). Roberts (1999) considered Cb. setariae as synonymous with R. oryzae-sativae , and R. fumigata . Roberts’ treatment also noted that Cb. setariae and Cr. oryzae-sativae were considered to represent Rhizoctonia AG-Bb, while R. fumigata represented Rhizoctonia AG-Ba. Rhizoctonia AG-Ba and AG-Bb have previously been shown to be genetically distinct entities ( Gónzalez et al. 2001), and this distinction is supported by the results of this study ( Fig. 1). Rhizoctonia AG-Ba ( R. fumigata ) and Rhizoctonia AG-Bb ( Cb. setariae / Cr. oryzae-sativae ) should therefore be retained as separate taxa. As the epithet setariae precedes the publication of the epithet oryzae-sativae (1912 vs 1919), the epithet setariae takes priority. Sequences identified as Ceratobasidium AG-Bb by Gónzalez et al. 2001 are selected here as representative sequences.