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Xerocomus parasiticus

 
Xerocomus parasiticus is unlikely to be confused with any other species, because it occurs only as a parasite of the Common Earthball, Scleroderma citrina. It is quite a rare bolete.

Identification guide

Cap

Young caps are hemispherical and downy, becoming smooth and expanding as the fruiting bodies mature.

When fully expanded, the caps of Xerocomus parasiticus range from 2 to 6 cm in diameter. The cap surface often becomes cracked in dry weather, revealing the thick pallid flesh beneath the cuticle.

Tubes and Pores

Large tubes terminate in angular olive pores that are at first yellow but darken through olive to olive-brown as the fruiting body matures.

When cut or bruised, neither the tubes nor the pores change colour appreciably, and there is no hint of bluing.

Stipe

Because it emerges from beneath a Common Earthball, the stipe of the Parasitic Bolete is invariably curved. There is no stem ring.

Olive or sienna, the stem tapers in towards the base and its pale lemon flesh does not change colour upon exposure to air.

Between 1 to 2 cm in diameter at the mid point, the stem is typically 3 to 6 cm long.

Spore print

The spores are olive-brown.

Odour/taste

Not distinctive.

Habitat

Found only as a parasite of the Common Earthball, Scleroderma citrinum. This species is more likely to occur in regions where the soil is calcareous.

Season

August to October.

Occurrence

Rare. 

Similar species

  1. Xerocomus Chrysenteron has a reddish stem, usually untapered, and its cap cracks to reveal red flesh immediately below the skin.
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