Cupreoboletus Simonini, Gelardi & Vizzini, in Gelardi et al., Mycologia 107(6): 1257 (2015)
Etymology: Cuprum (Latin), copper, referring to the tendency of the basidiomata to mature throughout toward copper tints.
Diagnosis: Basidiomata stipitate-pileate with tubular-poroid hymenophore, epigeous, medium to medium-large, evelate, hardly decaying; Pileus soon glabrous and slightly viscous, yellowish then copper red and eventually cinnamon-brown; Hymenophore poroid, adnate to slightly depressed around stipe apex, bright yellow to orange-yellow and finally copper-brown, with an uneven, toothed surface when mature; Stipe solid, rooting at the base, surface finely reticulate with elongated mesh darker than the ground; bright yellow discoloring cinnamon-copper red; Context creamy yellow, firm; tissues quickly turning dark blue when injured or exposed, then fading copperred to copper-brown; odor intense and sweet, persistent, permeating hands and fingers when basidiomata are handled, recalling propolis, cinnamon or poplar (Populus nigra) flower buds, flavor mild; hymenophore and to a lesser extent other parts of the basidiomata exude tiny, mostly acicular crystals on drying; Spore print olive-brown; basidiospores smooth, ellipsoidal to ellipsoidal-fusoid; Hymenial cystidia and Pseudocystidia common, with honey yellow, oily content; pileipellis a trichodermium of interwoven filamentous hyphae with vacuolar pigment; Hymenophoral trama bilateral-divergent of the “Boletus-type”; lateral stipe stratum of the “boletoid type” under a fertile caulohymenium; inamyloid trama; ontogenetic development gymnocarpic.
Distribution: in warm regions bordering the Mediterranean basin, associated with members of Fagaceae (Quercus).
Index Fungorum number: IF 812886
Type species: Cupreoboletus poikilochromus (Pöder, Cetto & Zuccherelli) Simonini, Gelardi & Vizzini 2015, in Gelardi et al., Mycologia 107(6): 1257 (2015)
Gelardi, Matteo & Simonini, Giampaolo & Ercole, Enrico & Davoli, Paolo & Vizzini, Alfredo. (2015). Cupreoboletus (Boletaceae, Boletineae), a new monotypic genus segregated from Boletus sect. Luridi to reassign the Mediterranean species B. poikilochromus. Mycologia. 107. 10.3852/15-070.