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Bitter Bolete

Tylopilus felleus

Meet Bitter Bolete, Tylopilus felleus, through field marks, range, soil ecology, safety context, community discovery, and its living role.

  • brown cap with a thick bolete shape
  • cited range context
  • Observation and caution only
Bitter Bolete showing brown cap with a thick bolete shape for field identification.
Image: gailhampshire from Cradley, Malvern, U.K · CC BY 2.0

At a glance

  • TypeFungus recorded in the plant queue
  • RangeThe map combines cited range units with public observation records for Bitter Bolete.
  • Field marksbrown cap with a thick bolete shape, pinkish pores as it matures, dark net-like pattern on the stem
  • SeasonPeak clues: Jul-Aug-Sep-Oct
  • SafetyObservation and caution only
Range & community finds

Where it grows in the wild

The map combines cited range units with public observation records for Bitter Bolete.13

Field marks

How to recognize it

Look for brown cap with a thick bolete shape, pinkish pores as it matures, dark net-like pattern on the stem before relying on one clue.

Brown Cap With A Thick Bolete Shape

brown cap with a thick bolete shape is one practical field mark to photograph when checking Bitter Bolete.

Pinkish Pores As It Matures

pinkish pores as it matures is one practical field mark to photograph when checking Bitter Bolete.

Dark Net-Like Pattern On The Stem

dark net-like pattern on the stem is one practical field mark to photograph when checking Bitter Bolete.

Don't mix it up

Lookalikes & how to tell them apart

Use several visible clues and the habitat together before comparing lookalikes.

King Bolete

Compare King Bolete with brown cap with a thick bolete shape and pinkish pores as it matures.. King Bolete can overlap in color, habitat, or general shape, so the whole plant, season, and surrounding habitat matter.

Bay Bolete

Compare Bay Bolete with brown cap with a thick bolete shape and pinkish pores as it matures.. Bay Bolete can overlap in color, habitat, or general shape, so the whole plant, season, and surrounding habitat matter.

The story

Bitter Forest Tester at work

Brown cap with a thick bolete shape is the detail that slows the eye first. On Bitter Bolete, it sits with pinkish pores as it matures and dark net-like pattern on the stem, so the plant becomes more than a name on a tag. It gives a person something visible to compare: shape, texture, season, and the ground around it. That first look matters because Bitter Bolete is a bitter forest tester, a subject whose story begins in a small field mark and then opens into soil, weather, people, and other living things.

Bitter Bolete looks like a generous woodland bolete, but its pinkish pores and bitter reputation make it a lesson in slow comparison. That is the line worth carrying outside. The strongest clue is not one isolated feature, but the way several clues meet. Bitter Bolete belongs to Boletaceae, and the public records behind this page place it in a wider map of observations and cited range references. The map should be read as a careful guide to reported and cited presence, not as a promise that every suitable place has been found. Living things leave uneven records because people notice them unevenly.

The first public discovery behind this page came from Mystic-Naturalist-9 in MO, United States on 2026-07-02. The location is intentionally coarse, which keeps the record useful without exposing a private spot. From that starting point, recognition becomes a patient habit. Photograph the whole plant, then move closer for brown cap with a thick bolete shape, pinkish pores as it matures, and dark net-like pattern on the stem. If the subject is young, dry, clipped, shaded, or past bloom, the best clue may be the setting rather than the most colorful part.

Lookalikes such as King Bolete and Bay Bolete are reminders to compare more than one trait. A similar leaf or flower can mislead when it is pulled away from the stem, season, and habitat. Bitter Bolete is usually described with woodland soil near tree roots. That habitat note is not decoration. It tells you where the species can gather water, light, shelter, and the quiet help of soil organisms. When you compare a possible match, include the neighboring plants and the surface under your feet.

The ecological story is grounded in ordinary work. Bitter Bolete forms partnerships with trees and sends its fruiting body up after damp weather. Its soil relationship is just as important: it works from root-zone soil and leaf litter, where fungal threads trade with trees and return nutrients as mushrooms age. Soil is not a backdrop here. It is where roots, old leaves, moisture, fungi, and small animals keep the next season possible. Its mild-looking cap hides an intense bitterness, so even a tiny taste is famous for spoiling a whole basket of edible-looking boletes.

A useful field prompt is simple. Pause at the edge of the plant and look from far to near. Notice the whole outline first, then the leaf, flower, stem, fruit, or seed head, then the soil or litter below it. Compare what you see with the season and the setting. Leave room for uncertainty, take one clear photo of the whole plant and one close detail, and let the next look add what the first look missed.

Ecology

Its place in the ecological web

Bitter Bolete acts as a bitter forest tester in its setting.

Living role

bitter forest tester

forms partnerships with trees and sends its fruiting body up after damp weather.23

Soil ecology

Soil and litter relationship

works from root-zone soil and leaf litter, where fungal threads trade with trees and return nutrients as mushrooms age.23

Timing

When to look

Most public clues for Bitter Bolete appear when Jul, Aug, Sep, Oct conditions show its visible growth.23

Leaves
Flowers
  • Peak bloom
  • Fading & dried heads
  • Leaves out
In Leafari

Found one? Keep a field journal

Save this species to your journal, earn its badge, and see community discoveries on an approximate, privacy-safe map.

  1. 1Coarse discovery location only
  2. 2Exact location and private photos are not shown
Leafari badge for Bitter Bolete

Bitter Bolete badge

Earned when you identify this species in Leafari.

In the Leafari community

1Total finds logged
1Explorers journaled it

First found in MO, United States, by Mystic-Naturalist-9

References

Sources

Key facts and claims trace back to a named reference. Superscript numbers in the text link here.

  1. GBIF species record for Tylopilus felleus distribution
  2. First Nature profile for Tylopilus felleus natural-history
  3. GBIF distribution records for Tylopilus felleus range
  4. Wikimedia Commons image source for Bitter Bolete image
  5. Leafari app records product-snapshot