Observation 331703: Boletaceae Chevall.

When: 2018-09-06

Collection location: Lake Co., Illinois, USA [Click for map]

Who: Mungo McGuffin

No specimen available

Rubroboletus sp? Suillellus sp?

Specimens found growing gregariously in N. Illinois under red oaks.

Red/pink caps: 2 to 4 inches in diameter, slimy when wet, tacky when dry, skin peels fairly easily, slightly shiny when dry. Cap surface bruised dark blue in situ post-rain on contact (specimens all wet) but no bruising of cap surface when specimens were dry.

Cap Flesh: yellow, bruised dark blue promptly (later fades to grey).

Pores: Dark orange with a thin yellow ring around the very edge of pores, bruised dark blue promptly. Tiny pores.

Stipe Surface: Surface bruised dark blue in situ post-rain on contact, but no bruising of cap surface when specimens were dry. Netting on stipe near top, reddish pigment on bottom half of stipe, yellow on top half.

Stipe flesh: yellowish, bruised dark blue promptly.

Taste/Smell: did not taste. Smell is indistinct, maybe slightly musty but could be my imagination.


Specimens were wet in situ, bruised quickly/prominently (dark blue) on stipe and cap surfaces when wet. Specimens’ surfaces DNS when dried.
Caps range from 2 to 4 inches or so in diameter. Sectioned example was sliced open several hours prior, dark blue staining has faded to grey.
Prominent netting on stipe
Cap slightly shiny/tacky when dry.

Proposed Names

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Recognized by sight

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