Species details
Rooting bolete
Butyriboletus appendiculatus
Extra caution required
Photo: Robert Kozak · CC BY-SA 3.0 · Photo source · License
Description
A bolete with an ochre-brown cap, bright yellow pores, and a stem tapering toward the base.
Identification features
The flesh may blue slightly when cut; the stem has a fine yellow net and often a rooting base.
Identification checklist
Check the entire fruitbody for identification. A bolete with an ochre-brown cap, bright yellow pores, and a stem tapering toward the base. The flesh may blue slightly when cut; the stem has a fine yellow net and often a rooting base. Typical habitat: Warm calcareous deciduous woodland under oak and beech.
Detailed features
- Cap
- 8–15 cm, dry, velvety, brown, without pink tones.
- Hymenophore
- Yellow tubes and pores; bruising may turn them greenish.
- Stem
- 6–8 × 3–4 cm, yellowish, with a yellow network and a somewhat rooting base.
- Flesh
- Yellowish; may blue to varying degrees when cut and may redden near the base.
- Smell
- Pleasant.
- Spore print
- Olive-green with a brownish tint.
Size
- Cap diameter
- 8–15 cm
- Stem height
- 6–8 cm
- Stem diameter
- 3–4 cm
Habitat
Warm calcareous deciduous woodland under oak and beech.
Fruiting period
June, July, August, September, October
Ecology
- Trophic mode
- Mycorrhizal
- Host trees
- Oak (Quercus), Beech (Fagus)
- Substrate
- Forest soil
- Soil
- Calcareous
- Notes
- Mycorrhizal with deciduous trees, especially in warm deciduous woodland.
How to separate similar species
Compare especially with these similar species: Butyriboletus subappendiculatus, Caloboletus radicans, Hemileccinum impolitum. Check the combination of cap shape and colour, spore-bearing surface, stem, flesh changes and habitat. A single feature or photograph is not enough; if the key characters do not match the description, do not treat the identification as confirmed.
Similar species
- Butyriboletus subappendiculatus
The related species is usually associated with conifers and its flesh normally does not blue.
- Rooting bolete (Caloboletus radicans)
Has a pale to almost white cap, blues more strongly, and is bitter.
- Iodine bolete (Hemileccinum impolitum)
The stem lacks reticulation; an iodine or carbolic smell may occur near the base.