| Butyriboletus appendiculatus | |
|---|---|
| |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Boletales |
| Family: | Boletaceae |
| Genus: | Butyriboletus |
| Species: | B. appendiculatus
|
| Binomial name | |
| Butyriboletus appendiculatus | |
| Synonyms | |
| |
Butyriboletus appendiculatus | |
|---|---|
 | Pores on hymenium |
 | Cap is convex |
 | Hymenium is adnate |
 | Stipe is bare |
 | Spore print is olive-brown |
 | Ecology is mycorrhizal |
 | Edibility is choice |
Butyriboletus appendiculatus is an edible pored mushroom that grows under oaks and other broad leaved trees such as beech. It is commonly known as the butter bolete. It often grows in large colonies beneath the oak trees, and is frequently found cohabiting with old oaks in ancient woodland. It is relatively rare in Britain. Its stipe and pores are often bright yellow (hence its name of butter bolete) and its flesh stains bright blue when cut or bruised.