Rhizoctonia microsclerotia Matz, Phytopathology

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 : 308

Rhizoctonia microsclerotia Matz, Phytopathology 7: 116. 1917. MB 271074.

Synonym: Thanatephorus microsclerotium (Matz) Boidin et al. [as ‘ microsclerotius ’], Mycotaxon 66: 482. 1998.

Type citation: ‘ Hab. On living leaves, branches and fruit of the cultivated fig, Ficus carica, Gainesville , Florida, U. S. A. ’ Roberts (1999) cites ‘ G. F. Weber 7850, FLAS’ as holotype .

ITS barcode: DQ279038 ( R).

UNITE 1.5 % SH: SH0814404.10FU. Alternative markers: ATP6 = DQ301616 (R); LSU = KP171642 (R); RPB2 = DQ301730 (R); TEF 1 = DQ301677 (R).

Notes: Thanatephorus microsclerotium is considered to represent Rhizoctonia AG-1-IB ( Boidin et al. 1998, Roberts 1999, Gónzalez et al. 2001). While Roberts (1999) treated R. microsclerotia as synonymous with Th. cucumeris (the anamorph name for R. solani ) molecular analyses by Boidin (1998), Gónzalez et al. (2001), and this study indicate that R. microsclerotia is genetically distinct from R. solani s. s. and that species-level recognition is warranted. Representative sequences for this taxon were selected from sequences available on GenBank generated from the CBS culture CBS 206.84 identified as R. AG-1-IB by Gónzalez et al. (2016).