Xerocomus subtomentosus (Suede Bolete)
Xerocomus subtomentosus (Suede Bolete)
Table of Contents
- Introduction
- Identification Guide
- Taxonomy & Classification
- Edibility & Safety
- Look-Alikes & Confusions
- Habitat & Ecology
- Foraging Guide
- Cultivation
- Culinary Uses
- Preservation & Storage
- Medicinal Properties
- Seasonal Fruiting
- Spore Print & Microscopy
- Varieties & Forms
- History & Ethnomycology
- Beginner's Guide
- FAQ
🍄 Introduction
Xerocomus subtomentosus, the suede bolete or yellow-cracked bolete, is a widespread bolete of mixed woodland recognised by its dry, velvety ochre-brown to olive-brown cap, large angular yellow pores that blue weakly or not at all when bruised, and tendency for the cap surface to crack in dry weather revealing yellowish flesh beneath. An edible but mediocre species, it is most valuable for teaching beginners about the Xerocomus group.
Cap 4–12 cm, convex to broadly umbonate, with a dry, finely felty-suede surface; colour ochre-brown to olive-brown, sometimes with slight greyish tones; cap surface typically cracks in dry conditions to reveal yellowish-ochre flesh. Flesh pale yellow, slightly bluing or not bluing at all when cut. Pores large, angular, 1–2 mm, bright yellow to ochre-yellow, bruising weakly blue-green or not at all. Stipe 5–10 × 1–2 cm, cylindrical, concolorous to cap or slightly paler, with longitudinal reddish streaks or fibrils, not reticulate, not ringed.
Quick Facts
| Common Names | Suede Bolete |
| Family | Boletaceae |
| Order | Boletales |
| Origin | Europe, North America, Asia |
| Edibility | Edible |
| Ecology | Ectomycorrhizal |
| Spore Print | Olive-Brown |
🔍 Identification Guide
Identify by: (1) dry, felty ochre-brown cap with tendency to crack; (2) large, angular yellow pores with weak or no bluing; (3) reddish-streaked non-reticulate stipe; (4) pale yellow flesh; (5) mixed woodland habitat. The combination of suede cap, large pores, and weak or absent bluing is characteristic. Taste confirms absence of bitterness.
Morphological Features
| Feature | Description |
|---|---|
| Cap Shape | convex to broadly convex, irregular |
| Cap Diameter | 3-12 |
| Cap Color | olive-brown to yellowish-brown |
| Cap Surface | dry, suede-like, often cracking to show red flesh |
| Gill/Pore Type | pores |
| Gill/Pore Color | bright yellow, bruising blue-green |
| Stipe Height | 4-10 |
| Stipe Diameter | 1-2 |
| Stipe Features | yellowish-brown, longitudinally ridged or striated |
| Flesh Color | pale yellow, faint bluing when cut |
| Bruising | weakly blues when cut |
| Odor | mild, pleasant |
| Taste | mild |
| Spore Print | olive-brown |
Field Identification Checklist
- Cap shape: convex to broadly convex, irregular
- Cap color: olive-brown to yellowish-brown
- Gill/pore type: pores
- Gill/pore color: bright yellow, bruising blue-green
- Spore print: olive-brown
- Odor: mild, pleasant
- Bruising: weakly blues when cut
- Stipe: yellowish-brown, longitudinally ridged or striated
Detailed Morphology
The dry, suede-like cap texture (from which the name 'suede bolete' derives) is distinctive. The reddish fibrillose streaks on the stipe, particularly in the lower half, are a useful but variable character. Bluing is weak and inconsistent, contrasting with the strong bluing of I. badia. Spore print olive to olive-brown. Cap cuticle a trichoderm of erect, cylindrical hyphae.
🧬 Taxonomy & Classification
Described by Bulliard (1788) and currently placed in Xerocomus, though the genus is under revision. Molecular work has shown Xerocomus sensu lato is polyphyletic, and several segregate genera have been proposed. X. subtomentosus sensu stricto is a European species; North American material may represent different taxa. Closely related to X. chrysenteron.
⚕️ Edibility & Safety
Edible but rated poor to mediocre by most sources. Soft flesh, unremarkable flavour, and tendency to harbour maggots limit its appeal. No toxicity documented. Safe to eat when cooked.
⚠️ Look-Alikes & Confusions
Xerocomus chrysenteron has red cracking between the areolae of the cap, smaller pores, and more consistent bluing. Xerocomus ferrugineus is more rusty-brown with similar pores. Imleria badia has a smooth (not cracking) chestnut cap and strong immediate bluing. The Xerocomus species form a somewhat confusing complex distinguishable by cap cracking pattern, bluing intensity, and stipe characters.
Known Look-Alikes
| Species | Edibility | Key Difference |
|---|---|---|
| Imleria badia | Choice Edible | Cap: bay-brown to dark chestnut; Odor: pleasant, mushroomy; Habitat: coniferous and mixed forests |
| Xerocomellus chrysenteron | Edible | Cap: olive-brown to grayish-brown, cracking to reveal red flesh; Habitat: broadleaf forest |
🌲 Habitat & Ecology
Ectomycorrhizal with a broad range of hosts including oak (Quercus), beech (Fagus), hornbeam (Carpinus), and possibly conifers in mixed woodland. Grows on mildly to moderately acidic soils. Found in temperate woodland throughout Europe, Asia, and North America. Common in parkland, hedgerow edges, and woodland clearings.
| Habitat | mixed and deciduous forests, parks |
| Substrate | soil |
| Ecology | Ectomycorrhizal |
| Host Trees | Quercus, Fagus, Betula, Pinus |
| Altitude | 0-1800 m |
| Climate Zones | temperate |
| Distribution | Europe, North America, Asia |
Ecological Role
Broad-host ectomycorrhizal associate contributing to the mycorrhizal network of diverse deciduous woodland. Ecologically versatile; may function as a secondary mycorrhizal partner in forest stands dominated by more specialised fungi.
🗺 Distribution Map
Known distribution of Suede Bolete: Europe, North America, Asia. This species is mycorrhizal (ectomycorrhizal).
🧺 Foraging Guide
Common but not worth prioritising. If collected, use only young firm specimens and check carefully for maggots. The soft flesh deteriorates quickly. Best used to fill out a mixed mushroom collection when better species are scarce. Collect in dry conditions when the cap cracking pattern aids identification.
🌱 Cultivation
Not commercially cultivated. Mycorrhizal with multiple hosts but requires living roots. No practical growing method.
🍳 Culinary Uses
If used, combine with more flavoursome species in soups and stews. Not suited to simple preparations where the mushroom is the feature. Drying improves the flavour profile. The soft texture deteriorates further with cooking; thick slices hold together better than thin ones.
| Culinary Uses | sautéed, soups |
| Preservation | drying |
📦 Preservation & Storage
Drying at 45–55 °C is the best option. Fresh storage limited to 1–2 days due to rapid softening. Pickling in vinegar is acceptable.
Preservation Methods
- drying
🩹 Medicinal Properties
Contains standard bolete antioxidant compounds and beta-glucans at levels similar to other Xerocomus species. No specific medicinal properties are documented. Not traditionally used medicinally beyond general tonic use.
🍂 Seasonal Fruiting
July through October in temperate Europe, with relatively consistent fruiting throughout the summer and autumn following rainfall. Less susceptible to dry spells than some boletes due to its broad host range and tolerance of varied habitats.
🔬 Spore Print & Microscopy
Spores fusiform, smooth, thin-walled, olive-brown in KOH, 10–14 × 4–5 µm. Basidia clavate, 4-spored. Cap cuticle a trichoderm with erect, cylindrical hyphae containing yellowish-brown incrusted pigment.
🌀 Varieties & Forms
No widely accepted varieties. Variation in cap colour and bluing intensity is reported but appears continuous. Some authors treat forms with strong bluing as approaching X. chrysenteron.
📜 History & Ethnomycology
Collected and eaten opportunistically across Europe but never prominently featured in culinary traditions. Appears in early mycological illustrations as an example of the broader bolete group. Its main cultural role is as a background member of the autumn mushroom harvest.
🎓 Beginner's Guide
A useful learning species for understanding the Xerocomus group and the concept of variable bluing. Use it to practice the lick-test for bitterness, the pore-bruising test for bluing, and cap texture assessment. Not the most exciting edible but identifies a useful gap in any beginner's bolete knowledge.
Photography Tips
Document the cap cracking pattern in dry conditions — the yellow-ochre exposed flesh between the areolae is a key diagnostic feature. Show the large angular pores in close-up and demonstrate the weak or absent bluing reaction by pressing the pore surface. The reddish stipe streaks should be included in a full-body shot.
Common Mistakes
While many blue-staining boletes are edible, this reaction requires careful species-level identification
Red pore surfaces occur in both edible (Suillellus luridus) and toxic (Rubroboletus satanas) species
Always taste a tiny piece raw (spit it out); bitter boletes like Tylopilus felleus ruin entire dishes
Troubleshooting
Soft, maggot-riddled specimens are common — inspect every specimen before collecting. If bluing is strong, reconsider identification toward I. badia or X. chrysenteron. Mediocre flavour in the pan is intrinsic; no cooking technique compensates significantly.
❓ Frequently Asked Questions
Can you eat Suede Bolete?
Yes, Xerocomus subtomentosus is edible but requires proper identification and thorough cooking. Some individuals may have sensitivities, so try a small amount first.
What mushrooms look similar to Suede Bolete?
Known look-alikes include Imleria badia, Xerocomellus chrysenteron. Careful identification using multiple features (cap, gills/pores, stipe, spore print, habitat) is essential to avoid confusion.
Where does Suede Bolete grow?
Xerocomus subtomentosus is found Europe, North America, Asia. It typically grows in mixed and deciduous forests, parks during summer to autumn.
What color is the spore print of Suede Bolete?
The spore print of Xerocomus subtomentosus is olive-brown. Taking a spore print is an important step in mushroom identification.
When is the best time to find Suede Bolete?
Xerocomus subtomentosus typically fruits during summer to autumn. Fruiting is often triggered by rainfall followed by appropriate temperatures for the species.
📋 Summary — Xerocomus subtomentosus (Suede Bolete)
Xerocomus subtomentosus, the suede bolete or yellow-cracked bolete, is a widespread bolete of mixed woodland recognised by its dry, velvety ochre-brown to olive-brown cap, large angular yellow pores that blue weakly or not at all when bruised, and tendency for the cap surface to crack in dry weather revealing yellowish flesh beneath. An edible but mediocre species, it is most valuable for teaching beginners about the Xerocomus group.
Related Species
Xerocomus chrysenteron (red cracking cap, stronger bluing), Xerocomus ferrugineus (rust-brown cap), Imleria badia (smooth chestnut cap, strong bluing), Boletus pruinatus (frosted stipe, stronger bluing). The suede texture, large pores, and weak bluing combination is characteristic.