Hortiboletus rubellus, commonly known as the ruby bolete, is a small, dainty, brightly coloured member of the family Boletaceae, with a reddish cap and stipe, and yellow pores.

), published in 1844, is now reduced to synonymy as it postdates the current name by German mycologist Julius Vincenz von Krombholz which dates from 1836.

This cap is scarlet to raspberry red when young, with a dry velvety texture,[6] often cracking in age.

[7] The extreme margin often has a pale yellow or white band around it, and it discolours darker and dirtier with age.

[6] Conflicting information on pore size in notable publications is a possible indication that there may be more than one species involved, both in Britain and in North America.

[13] In Europe, this species is often mistaken for the similar B. armeniacus[citation needed] which does not show the same red coloration in the stem base.