This is the largest species in subsect. Atropurpurinae; the stipe surface turns more or less gray with age.
Photo © Marco Floriani.
The nomenclature of this species is very problematical: R. undulata and R. krombholzii are two of the synonyms which are often used to name it.
Photo © Jan Vesterholt.
Photo © Ruben Walleyn.
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