Boletus innixus

For many years B. innixus and B. caespitosus were treated as synonyms of B. auriporus Peck. B. innixus is characterized by its gourd-like, tomentose basal area (very viscid in wet weather) and its yellow mycelium and its frequently caespitose habit. In contrast, B. auriporus has white basal mycelium, non-gourd like basal area that is usually white, and a minute yellow floccosity covering the stipe. Singer included these taxa in his concept of the genus Pulveroboletus (interpreting the viscidity as a kind of veil) while Pouzar created the genus Aureoboletus to accomodate these and similar taxa with bright yellow hymenophore.