Appearance
A brightly coloured and distinctive bolete, "Boletellus obscurecoccineus" has a rose-red or rhubarb-coloured, hemispherical to convex cap to a diameter of 7 cm, with an overhanging margin when young. The cap may crack in older specimens, and reveal the yellow flesh beneath. The adnexed pores are five- or six-sided and yellow. They bruise blue in some specimens. The narrow stipe lacks a ring, and may reach 9.5 cm tall with a diameter of 2 cm. It is reddish and scaled overall, fading to yellow under the cap. The spore print is a dark brown. The mycelium is white. There is no significant odour and the taste is mild. Under the microscope, the elongated pale yellow spores measure 14.5–19.5 by 6–7.5 μm.
Naming
Similar-looking African collections initially reported as "Boletellus obscurecoccineus" have been redescribed as "Boletellus rubrolutescens". The North American and European species "Boletus rubellus" has colouration that is somewhat similar to "B. obscurecoccineus", but it lacks the scaly stem of the latter.
Distribution
The distribution includes Korea, New Guinea, Java, Borneo, Japan, and Taiwan. Within Australia, the rhubarb bolete has been recorded from southwestern Western Australia, and the southeast of New South Wales, and into Victoria and Tasmania.
Habitat
The rhubarb bolete is an ectomycorrhizal species, found in the leaf litter of eucalyptus forests in Australia, and with oak and other deciduous trees in Asia. Fruit bodies appear over the summer and autumn, from July to November.References:
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