Porcini vs Weeping Bolete
Boletus edulis compared with Suillus granulatus — how to tell them apart in the field.
How to Tell Them Apart
Much more robust with a non-slimy cap, prominent white reticulation on the stem, and white pores when young. Not exclusively associated with pines. Superior in flavor and texture. The slimy cap of Suillus is an immediate visual separator.
Side-by-Side Identification
| Trait | Porcini | Weeping Bolete |
|---|---|---|
| Cap | 7–30 cm across, sometimes larger. Convex when young, flattening with age. Color ranges from pale tan to dark brown, often with a slightly sticky surface when wet. The edge is sometimes lighter than the center. Young caps feel firm and almost bread-like — hence the English name 'penny bun.' | 4-12 cm across. Convex to broadly convex, sometimes flat with age. Color ranges from pale yellowish tan to cinnamon brown to dark brown. Surface is very slimy and viscid when wet, shiny when dry. The skin peels easily from the cap edge toward the center. |
| Gills | No gills. Instead, the underside has a dense sponge-like layer of pores (tubes). White when very young, turning yellowish then olive-green as spores mature. The pore surface doesn't bruise blue when pressed — this is a key identification feature. | No gills. Has tubes ending in small, round, yellowish pores. Young specimens produce milky white to yellowish droplets from the pore surface ('weeping'). These droplets dry to brown granules. Pores are pale yellow, becoming more ochre with age. Do not bruise blue. |
| Stem | Thick and bulbous — 8–25 cm tall and up to 10 cm wide, often wider at the base. White to pale brown, covered with a fine raised network pattern (reticulation) especially near the top. This net pattern is one of the most reliable ways to confirm you've got a real porcini. | 3-8 cm tall, 1-2.5 cm thick. Solid, pale yellowish to whitish. No ring. Upper portion dotted with brownish granules (dried droplets), which is the most reliable field character after the weeping pores. No reticulation. |
| Spore print | Olive-brown to dark brown. | Brown to ochre-brown. |
| Odor | Pleasant, nutty, slightly yeasty — often described as 'the smell of a good bakery.' | Mild, slightly fruity. Not particularly distinctive. |
| Habitat | Forms mycorrhizal relationships with a wide range of trees: spruce, pine, birch, beech, oak, and chestnut. Found in coniferous and mixed forests, often along trails, clearings, and forest edges. Prefers well-drained, slightly acidic soils. Frequently appears in the same spots year after year — which is why experienced foragers memorize their patches. | Exclusively mycorrhizal with pines (Pinus species). Found in pine plantations, pine-dominated natural forests, parks with planted pines, and coastal pine woodlands. Grows in sandy and well-drained soils. Often fruits in large troops of dozens to hundreds of specimens. |
| Season | Late summer through autumn, typically August through November. In warmer Mediterranean climates, a second flush can appear in spring. Peak season is September–October across most of Europe and North America. | June through November, with peak fruiting in August and September. Appears after warm summer rains and continues through autumn. |
Found one of these in the wild? Don't rely on memory — identify it from a photo with Orangutany and check it against both species before you touch it.