(2864) Proposal to conserve the name <i>Microsphaera alphitoides</i> ( <i>Erysiphe alphitoides</i> ) ( <i>Ascomycota</i> : <i>Erysiphaceae</i> ) with a conserved type

(2864) Microsphaera alphitoides Griffon & Maubl. in Bull. Trimestriel Soc. Mycol. France 28: 103. 1912, nom. cons. prop. Typus: Switzerland, Neuchâtel, on Quercus robur, 4 Apr 1999, Takamatsu (TNS barcode TNS-F87437), typ. Erysiphe (Griffon Maubl.) U. Braun S. Takam. (in Schlechtendalia 4: 5. 2000) (≡ 1912) is a common, widespread, and almost cosmopolitan powdery mildew oaks. It pathogen of economic forest pathological importance (Desprez-Loustau al. Fungal Ecol. 36: 39–50. 2018). Maublanc (l.c.) described from petraea (and not Q. robur as previously assumed). Exact publication dates (month day) are given the journal. For more than 100 years, this name has been used for most common oak Asia Europe (Blumer Beitr. Kryptogamenfl. Schweiz 7: 317. 1933; Homma Trans. Sapporo Nat. Hist. 13: 383. 1937; Beih. Nova Hedwigia 89: 386. 1987; Cook, Taxon. Manual Erysiphales (Powdery Mildews) [CBS Biodivers. Series 11]: 432. 2012). assumed that type material was deposited at PC herbarium Paris but failed to trace it or any other European herbaria. Res. 111: 814. 2007), assuming holotype be lost, proposed neotype M. alphitoides, including ex-neotype sequences. However, they overlooked (l.c.: t. 5, fig. 25–29) had published an illustration (drawing) belongs, according Art. 9.4, original name. This must taken into consideration lectotypification purposes (Art. 9.3), especially absence holotype. specimen recently found Farlow Herbarium (FH), under quercina. Since seems only existing material, may regarded 9.1, Note 1), thus fixing application results performed sequence analyses (Bradshaw Forest Pathol. 52: submitted. 2022) revealed sequences identical those currently referred quercicola 819. i.e., E. becomes heterotypic synonym alphitoides. The mildew, which so far assigned would require new grouping ex-holotype with accordance findings evaluating invasion Europe, suggested Microsphaera/Erysiphe present herbaria until 1921; did become widespread throughout after 1960 (Gross Biol. Invas. 23: 885–901. 2020). names ruled by corresponding types 7.1), rediscovery lead use hitherto quercicola. effects discovery identity enormous cause confusions. Without detailed explanations underlying data, difficult future ascertain To avoid confusion upheaval we propose conserve “neotype” (Takamatsu al., l.c.) conserved type. With proposal, intend maintain their present, established sense circumscription.