Genus: Boletus (will probably change – see Science Notes)
- Genus 2: Likely to become Sutorius or Neoboletus
- Species 2: This is probably the species name that will survive an eventual merger with the other oak-loving red-mouths, “Boletus” discolor and luridiformis. See the Science Notes.
Common Name: Red Mouth Bolete
Tells: Reddish cap bruises blue/black & is often olive when young. Pores start yellow, become rosy red, age to orange, & bruise blue. Pale yellow stem, often w/reddish dots, browns from base up w/age.
Other Information: Bright yellow flesh blues too, also very fast. Likes oak. Stem may be dotted but is not netted and does not have hairs, which distinguishes from lookalikes. Odor described as “peculiar and somewhat pungent but distinctive.” That is the old line used to distinguish it from discolor and luridiformis.
Science Notes: The European species formerly known as Boletus discolor, and Boletus luridiformis, Boletus erythropus, and Boletus queletii have been merged into a single species that is now called Sutorius (f/k/a Neoboletus) queletii. (Boletes of Eastern North America follows this by merging the American “discolor” into “luridiformis,” using Neoboletus as the genus). It is a mushroom with massive flexibility in how it appears.
Here’s the problem: are we justified in doing the same for the North American mushrooms known by (some) of those species names? We can be pretty sure they are not the European queletii and unpublished amateur DNA work shows that the oak-loving ones do indeed follow the same pattern – massive morphological flexibility with the same DNA – but what is the appropriate American name? Especially when different reactions to both Ammonia and KOH have been reported? They probably are the same thing… but we cannot say that with enough confidence to justify removing entries that still appear in the books, or to merge them without a proper, peer reviewed article in a reputable scientific journal. For this reason discolor, luridiformis and subluridellus still appear here under separate names even though they are likely to end up being merged. If you must pick one, use subluridellus – at least it is an American name that won’t have to change. FWIW, those same DNA tests show that the hemlock loving B. subvelutipes really is a separate species. Stay tuned for new developments.
And about that genus… We have kept “discolor” in Boletus for now because that is the accepted “grab bag” and there is not enough evidence to move it int0 another genus. One hopes the science will catch up to both of these, along with the other hard-to-distinguish red pored, blue staining lookalikes such as , B. subluridus and B. flammans, not to mention the one now known as Suillellus luridus, the several moved to Rubroboletus, and the brown-pored blue-stainers vermiculosus and vermiculosoides.
Edibility: The traditional instruction in America was clear: “Avoid the red-pored blue-stainers like this one because they are known sick makers.” That came under question beginning in the 2010’s as DNA evidence proved that these mushrooms are quite distinct from the Rubroboletus and Suillellus genera that contain the true “Satans Boletes”. For what it’s worth, the lookalike European mushroom called luridimormis/discolor is a highly prized edible commonly known as the Scarletina. So it comes down to your taste for adventure and your respect for received wisdom.
- NH4OH (Ammonia): No data.
- KOH: No data.
- FeSO4 (Iron Salts): Blue-stained cap flesh turns yellow and then orange.