Boletinellus merulioides (“Ash Tree Bolete”)

Yellow pores have distinct veins across the surface, & often stain slowly blue.

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Description

Name in North American Boletes: Gyrodon merulioides

Genus: Boletinellus

  • Genus 2: Gyrodon

Species: merulioides

Common Name: “Ash Tree Bolete”

Tells: Yellow pores have distinct veins across the surface, & often stain slowly blue.

Other Information: Yellow cap flesh may slowly stain blue-green. Cap bruises a dull yellow-brown. Stem bruises red-brown.

Science Notes: This is a particularly interesting mushroom from the scientific point of view, with all sorts of odd bits of trivia in addition to the distinctive veins. E.g., it’s relationship is with a parasitic aphid that preys on Ash Trees rather than with the trees themselves. It’s worth a bit of reading if your curious about such things. DNA testing moved this mushroom from Gyrodon into Boletinellus, along with all the other North American Gyrodons except G. lividus.

Edibility: Good.

CHEMICAL TESTS:

  • NH4OH (Ammonia): Cap skin turns blackish, then fades to dull red or orange.
  • KOH: Cap skin turns blackish, then fades to dull red or orange.
  • FeSO4 (Iron Salts): No data.

Links:

National Audubon Society Field guide to Mushrooms, Gary Lincoff 564 Mushrooms of West Virginia and the Central Appalachians 321 North American Boletes 187 82

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Jackson
1 year 1 month ago

Spore print color?

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Scott Pavelle
1 year 1 month ago

North American Boletes reports it as olive-brown. Nothing unusual.