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Oregon brown truffle

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Kalapuya brunnea, the Oregon brown truffle, is a native truffle of the Pacific Northwest that is shaved raw over warm food. Sources describe it as a gourmet edible, and its safe identification needs an expert.

Two whole brown truffles and two halves with pale marbled interiors rest on a warm ivory surface.

Overview

Kalapuya brunnea, known as the Oregon brown truffle, is a truffle of lowland and foothill forests in western Oregon and northern California. It is one of four native Oregon truffles that extension sources treat as gourmet edibles. It grows underground and is found by its aroma and by the ground above it rather than by any visible fruit body.

Names and taxonomy

The accepted name in the extension summary is Kalapuya brunnea. Earlier work placed the species in the genus Leucangium under the name Leucangium brunneum. The catalogue entry gives the epithet with a single letter-change spelling, brunnea, and this page keeps the spelling of the accepted name.

Description

The outer skin is orange-brown and granular to warty. The flesh is firm and mostly white, with grey spore pockets that give a marbled look. The fruit body is larger than the white truffles and is found in a more limited range. It has a garlicky smell.

Habitat and season

The species grows in lowland and foothill forests, mainly west of the Cascade Range and in the Coast Range foothills above the Willamette Valley. The extension summary associates the gourmet specimens with Douglas-fir trees and notes that it often fruits in the same places and seasons as the Oregon black truffle. The season given is September through February.

Use

The truffle is not cooked. It is shaved thinly over warm, fatty foods such as eggs, meat, butter or cream sauce. A fat can take on its aroma if it is stored sealed with the truffle, without direct contact.

Storage

The summary advises an airtight container with more air space than truffles, lined with paper towels, kept refrigerated and dry, with the truffles not touching each other. It stays usable for about a week, depending on the species.

Lookalikes and safety

Many truffle species are not gourmet edibles. The extension summary says spongy, squishy, hollow or powdery truffles are not edible, and that edible specimens are firm, close to a pencil eraser in texture, with a marbled or speckled interior. The summary states that none of Oregon's native truffle species is poisonous, and it also advises never to eat a wild truffle or mushroom unless it has been identified with absolute confidence. This page gives no identification verdict beyond that.

Places

Western Oregon

Documented use · Region evidence

Lowland and foothill forests west of the Cascades and above the Willamette Valley; a collecting range, not a cultivated origin.

Northern California

Documented use · Region evidence

Named in the same extension summary as part of the species' range.

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