Search on : Taxa descriptions


 Add this item to the list  Boletus gabretae
Page number:77 
Remarks (internal):Pilát (1968) also discussed the relationships between B. gabretae and B. luridus. He showed that the colour difference is not the only distinguishing character, since these species also differ in their iodine reactions, B. luridus having amyloid hyphae. B. luridus often has a basally reticulated stipe, while in B. gabretae the network covers its upper third. The reticulation itself is also different. In B. luridus the mesh is extended lengthwise, while in B. gabretae the mesh is wider (Figs. 1-2).
The specimen found in the same locality in 1979 was identical with that described.
Description type:Non-original description 
Description:Boletus gabretae
The asymmetrical cap of the only specimen had a maximum diameter of 8 cm. The surface was velvety and the free margin of the cuticle was clearly observed when fresh, being about 1 mm wide. The stipe was fasciated, 4.5 x 2.5 cm in cross-section, clearly velvety at least in the lower parts, having on overall yellow colour, with grey and brown-yellow tints; the reddish brown colour of the base extended ca. 2 cm upwards. The upper part (a quarter to a third) of the stipe was covered by a net. When touched, all parts of the stipe turned bluish and then rapidly became very dark blue. The flesh was yellow or yellowish, but changed in a few seconds to blue and darkened rapidly. In this colour the specimen resembled B. junquilleus (Quél.) Boudier, described by Watling (1970) as 'brilliant lemon-yellow or lemon chrome with or with-out flush of luteous ... and tubes lemon chrome, to red ...' That species, however, does not have a reticulated stipe. A yellow bolete with apically reticulated stipe has been described by Pilát (1968) as Boletus gabretae. The specimen from Avensor, Finland, is almost identical with the species of Pilát, resembling, when touched, Fig. 58a of Pilát and Dermek (1974). That Figure, however, lacks the dark reddish colour at the base of the stipe typical of the Finnish specimen. In this feature our specimen resembles B. junquilleus in Fig. 57 of Pilát and Dermek (1974), thought there the red extends up to the cap. The microscopic characters hardly serve to differentiate B. junquilleus from B. gabretae (Pilát 1968). The spores of the Finnish material measure 10.4 x 4.9 µm, while Pilát gives 12-15 x 5.5-6 pm.
Taxon name: