Boletus miniato-olivaceus

Rosy pink-red cap adds tan w/age. Yellow pores add red w/age, becoming dingy olive, & quickly stain blue before resolving to brown. Chemical tests.

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Description

Genus: Boletus

Species: miniato-olivaceus

Tells: Rosy pink-red cap adds tan w/age. Yellow pores add red w/age, becoming dingy olive, & quickly stain blue before resolving to brown. Chemical tests.

Other Information: White to pale yellow cap flesh has a thin red layer under the cap skin, & stains blue (sometimes slowly). Yellow stem with red or brown markings. According to North American Boletes this mushroom has an association with beech, but several experts in the Northeast have reported an association with hemlock, and noted that it is particularly common in woods where hemlock and beech occur together.

Edibility: Avoid. A known sick-maker.

CHEMICAL TESTS:

  • NH4OH (Ammonia): Cap surface turns orange/yellow to amber/brown, often with a bluish ring. Cap flesh has no reaction.
  • KOH: Cap surface flashes olive-yellow, then rapidly turns olive-green or olive-bronze. Cap flesh turns pale orange.
  • FeSO4 (Iron Salts): Cap surface turns grayish olive. Cap flesh turns pale yellowish.

Links:

National Audubon Society Field guide to Mushrooms, Gary Lincoff 0 Mushrooms of West Virginia and the Central Appalachians 0 North American Boletes 129 117

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