The two different types of pileipellis found in European species of Chroogomphus. A. Subgenera Siccigomphus and Floccigomphus are characterized by species with broad pileipellis hyphae that lack a gelatinous layer; non-gelatinised pileipellis hyphae of C. cf. helveticus (H7019100). B. Species of subgen. Chroogomphus have narrower pileipellis hyphae embedded in a gelatinous layer; these gelatinised pileipellis hyphae are found in all other European species, in this example, C. britannicus (K(M)77895, holotype). Bar = 50 µm. Photographs: Ross Scambler.