Hortiboletus campestris Biketova & Wasser
Year: 2025
Type: article
Abstract: Hortiboletus campestris (A. H. Sm. & Thiers) Biketova & Wasser, Index Fungorum 257: 1 (2015) ≡ Boletus campestris A. H. Sm. & Thiers, Boletes of Michigan: 266 (1971) = Boletus harrisonii A. H. Sm. & Thiers, Boletes of Michigan: 267 (1971) Examined material. USA • Michigan: Washtenaw Co., Ann Arbor, 42°16'31"N, 83°43'51"W, gregarious on lawn, 16. 07. 1966, leg. & det. A. H. Smith, MICH 4999 (A. H. Smith 72961 – collector’s number, holotype), GenBank: ITS – PV 036230, LSU – PV 036235, tef 1 - α – PV 106168, and rpb 2 – PV 106172; • Washtenaw Co., Ann Arbor, 42°16'31"N, 83°43'51"W, gregarious on lawn near Picea sp., 01. 07. 1967, leg. K. A. Harrison, det. A. H. Smith, MICH 10011 (K. A. Harrison 9504 – collector’s number, holotype of Boletus harrisonii), GenBank: ITS – PV 036229, LSU – PV 036234, tef 1 - α – PV 106169, and rpb 2 – PV 106173). Notes. Conspecificity of H. campestris and B. harrisonii was proven by phylogenetic multilocus and four single-locus analyses of their holotypes MICH 4999 and MICH 10011, respectively (Figs 1, 2). In the phylogenomic tree of Tremble et al. (2024), they also cluster together in one species-level clade. In the current multigene phylogeny, H. campestris occupies a rather isolated position in the crown clade of Hortiboletus and forms a strongly-supported terminal clade (BS = 100; PP = 1.00). There is a lot of confusion in field recognition and identification of this species. Based on the sequence data from INSDC and connected collection data from publications (Frank et al. 2020; Kuo and Ortiz-Santana 2020), as well as iNaturalist (2024), all specimens identified as H. campestris (MICH KUO- 08240502 (based on the tef 1 - α sequence MK 721094 and rpb 2 – MK 766302), F: PRL 5991 MAN, F: PRL 5879 MAN, and iNaturalist 66900805), Hortiboletus sp. ‘ campestris ’ (DD 614), or B. harrisonii (MICH KUO-09071204 and PBM 4097) actually belong to Hortiboletus flavorubellus (see below). Moreover, the LSU sequence of the MICH KUO- 08240502 collection identified as H. campestris, actually belongs to another collection and species – Xerocomus tenax Nuhn & Halling. Additionally, there are no H. campestris collections represented by their ITS sequences in INSDC, which are correctly identified to the species level (see Fig. 1 and Suppl. materials 1, 3). Further studies on the morphology and distribution of H. campestris are really needed.
Institutions: Royal Botanic Gardens, Kew, HUN-REN Szegedi Biológiai Kutatóközpont, Institute of Biochemistry, Hungarian Research Network, University of Haifa, Tula State Pedagogical University named after L.N. Tolstoy, James Hutton Institute, Komarov Botanical Institute of the Russian Academy of Sciences, Agricultural University of Athens, National Academy of Sciences of Ukraine, M.G. Kholodny Institute of Botany, University of Turin, Eötvös Loránd University
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W6930867487
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