Phyllactinia liriodendri U. Braun

Phyllactinia liriodendri U. Braun, in Braun and Cook, Taxonomic Manual of the Erysiphales (Powdery Mildews): 260. 2012. Type. USA • Pennsylvania, Centre County, State College Campus, on Liriodendron tulipifera, 1889, W. A. Buckhout (BPI 859705 — holotype). Epitype. (designated here, MycoBank, MBT 10025444): USA • North Carolina, Wake County, Raleigh, on Liriodendron tulipifera, November 1972, L. Lazo s. n. (NCSLG 22914). Ex-epitype sequences: PQ 585171 (ITS), PQ 589086 (TUB). Notes. Phyllactinia liriodendri was included in phylogenetic-taxonomic studies recently published by Bradshaw et al. (2025 b). The authors suggested that sequences from specimens of this species form highly supported species clades in concatenated, ITS + 28 S, and TUB analyses, confirming the status of P. liriodendri as a species within the morphologically poorly differentiated genus Phyllactinia, which requires sequence data for unequivocal identifications. Ex typus sequences are the best option to obtain and analyze reference sequences for phylogenetic-taxonomic purposes. However, the type of P. liriodendri from 1889 is very old and sequencing was not attempted. In such cases, epitypification with ex-epitype sequences is the method of choice.