Boletus edulis
| Boletus edulis | |
|---|---|
 |
|
| In a forest near Rambouillet, France | |
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Boletales |
| Family: | Boletaceae |
| Genus: | Boletus |
| Species: | B. edulis |
| Binomial name | |
|
Boletus edulis Bull. (1782) |
|
| Synonyms | |
| Boletus edulis | |
|---|---|
| Mycological characteristics | |
 |
pores on hymenium |
 |
cap is convex |
 |
hymenium is adnate |
 |
stipe is bare |
 |
spore print is brown |
 |
ecology is mycorrhizal |
 |
edibility: choice |
| Nutritional value per 100 g (3.5 oz) | |
|---|---|
| Energy | 342.4 kJ (81.8 kcal) |
|
1.70 g
|
|
|
7.39 g
|
|
| Vitamins | |
| Thiamine (B1) |
(9%)
0.105 mg |
| Riboflavin (B2) |
(8%)
0.092 mg |
| Niacin (B3) |
(40%)
6.07 mg |
| Pantothenic acid (B5) |
(53%)
2.64 mg |
| Vitamin B6 |
(4%)
0.051 mg |
| Folate (B9) |
(73%)
290 μg |
| Vitamin C |
(5%)
4.21 mg |
| Minerals | |
| Calcium |
(0%)
1.195 mg |
| Iron |
(6%)
0.739 mg |
| Phosphorus |
(3%)
22.26 mg |
| Potassium |
(4%)
203.3 mg |
| Zinc |
(44%)
4.172 mg |
|
|
| Percentages are roughly approximated using US recommendations for adults. Source: USDA Nutrient Database |
|
Boletus edulis (English: penny bun, cep, porcino or porcini) is a basidiomycete fungus, and the type species of the genus Boletus. Widely distributed in the Northern Hemisphere across Europe, Asia, and North America, it does not occur naturally in the Southern Hemisphere, although it has been introduced to southern Africa, Australia, and New Zealand. Several closely related European mushrooms formerly thought to be varieties or forms of B. edulis have been shown using molecular phylogenetic analysis to be distinct species, and others previously classed as separate species are with this species. The western North American species commonly known as the California king bolete (Boletus edulis var. grandedulis) is a large, darker-coloured variant first formally identified in 2007.
The fungus grows in deciduous and coniferous forests and tree plantations, forming symbiotic ectomycorrhizal associations with living trees by enveloping the tree's underground roots with sheaths of fungal tissue. The fungus produces spore-bearing fruit bodies above ground in summer and autumn. The fruit body has a large brown cap which on occasion can reach 35 cm (14 in) in diameter and 3 kg (6.6 lb) in weight. Like other boletes, it has tubes extending downward from the underside of the cap, rather than gills; spores escape at maturity through the tube openings, or pores. The pore surface of the B. edulis fruit body is whitish when young, but ages to a greenish-yellow. The stout stipe, or stem, is white or yellowish in colour, up to 25 cm (10 in) tall and 10 cm (4 in) thick, and partially covered with a raised network pattern, or .
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