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Parasitic bolete

Pseudoboletus parasiticus


Pseudoboletus parasiticus is unlikely to be confused with any other species, because it occurs only with the common earthball, Scleroderma citrinum. Young caps are hemispherical and downy, becoming smooth and expanding as the fruiting bodies mature. When fully expanded, the caps of Pseudoboletus parasiticus range from 2 to 6 cm in diameter. The cap surface is greasy in wet weather but often becomes cracked in dry weather, revealing the thick pallid flesh beneath the cuticle. 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. Because it emerges from beneath a common earthball, the stem of the parasitic bolete is invariably curved. Olive or sienna, the stem tapers in towards the base, 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 and has no stem ring.


The parasitic bolete is found in most countries in central and northern Europe, but is seldom recorded in the Mediterranean region. This bolete is also reported from some parts of North America. 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.


Spotted in Kroondomein 't Loo. (sources: see reference)

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Jae a month ago

Sure, mauna Kunzah :)

mauna Kunzah
mauna Kunzah a month ago

Hi Jae! Consider swapping out one of your missions for the 2019 Best Wildlife Photo mission, because this appears to be an interesting example of interaction between species.

Spotted by

Gelderland, Netherlands

Lat: 52.27, Long: 5.87

Spotted on Aug 29, 2017
Submitted on Oct 11, 2019

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