Name in North American Boletes: Boletus griseus var. fuscus
- Genus 2: Boletus
- Genus 3: Xercomus
- Species 2: griseus var. fuscus
- Species 3: fuscus (the name used at MushroomExpert.com)
Tells: Grows with pine. Bugs leave dark brown holes w/bright yellow stains in flesh that may stain slowly red. White-gray, red-staining stem has broad netting that darkens w/age.
Other Information: Likes pine (regular griseus likes oak), and also has a darker gray cap, and a stem that is a little more red toward the bottom. The stem flesh may also be a little more yellow that griseus‘. Like the regular version it has an unfortunate tendency to be bug-infested. Some outlier collections have blued in cut flesh.
Science Notes: Once supposed to be an invasive Japanese species, this is now understood to be a native counterpart to R. griseus that evolved to live with conifers rather than hardwoods, and has an Atlantic coast range from Canada to Central America.
- NH4OH (Ammonia): No data.
- KOH: No data.
- FeSO4 (Iron Salts): No data.