Synonyme: Boletus elegans; Boletus grevillei; Cricunopus elegans; Ixocomus elegans.
English: Greville's bolete; Larch bolete.
German: Gold-Röhrling; Goldgelbe Lärchen-Röhrling.
Region: North America, Europe; Asia, Taiwan.
Habitat: soil of mixed forests, near but not always close to larch, with which it lives in symbiosis.
Content: grevillin; genetic and enzymatic basis for atromentin, the precusor to various pulvinic acid-type pigments, has been characterized (an atromentin synthetase by the name, GreA. A cosmid library (31 249 bp in total) has been made from the genome. The estimated gene density based on the cosmid library is 1 per 3900 bp of genomic DNA. The genome has a GC content of 49.8%.
Cap: ± 7 cm in diameter; brilliantly citrus yellow to burnt orange;hemispherical, then bell-shaped, and finally flattened; tight; shiny and wet looking with its mucous slime layer; sticky skin, short tubes of yellow or brownish which descend down to the bottom; hymenium easily separates from the flesh.
Stalk: cylindrical; quite slender; ring or a tight-fitting annular zone; 7 cm long, ± 2 cm wide; cream-colored turning to reddish brown with a cream-white ring; thin meat, consistency at first, then quickly soft; odor of rumpled Pelargonium geranium leaves.