Ponderosa Pine Pinus ponderosa

Ponderosa pine is a dry-side conifer of the Pacific Northwest, common on the east side of the Cascades in Washington and Oregon where summers are warm and dry. Mature trees have thick, orange-brown bark in jigsaw-puzzle plates, and the crevices often smell of vanilla or butterscotch on a warm day.

Ponderosa pine is fire-adapted: older trees have thick bark that protects them from fire damage, and the species is considerably more fire tolerant than Douglas-fir (USFS Silvics of North America). Fire also matters to foragers. Burn morels fruit in burned conifer forest the spring after a fire, and ponderosa stands are among the forests that burn on the dry side. The morels are not partners of the trees; what triggers them is still not fully understood.

The long needles grow in bundles of three in the Northwest, and the canopy is open enough for light to reach the forest floor. Like other pines, ponderosa is ectomycorrhizal. Its fungal partners include slippery jacks (Suillus) and false truffles (Rhizopogon), plus a few boletes, such as the spring king, that fruit under it.

Ponderosa pine ranges from southern British Columbia south through the mountains of Washington, Oregon, and California. In Washington and Oregon, look for it on the east side of the Cascades, from the Okanogan to the Deschutes, and into the Blue Mountains.

Associated Mushrooms

Ponderosa pine hosts ectomycorrhizal fungi, including Suillus and a few Boletus species. Burn morels, which are not mycorrhizal partners of the pine, fruit in ponderosa stands after fire. Here are some of the notable species you may meet.

Pine Slipperycap

Suillus pseudobrevipes

Often abundant under ponderosa pine in wet years, and also found under shore pine on the coast. A slimy, honey-brown-capped bolete with pale yellow pores. It fruits mostly in fall, and fairly often in spring on the east slope of the Cascades (Siegel & Schwarz, Mushrooms of Cascadia).

Mycorrhizal Edible

Bluing Slippery Jack

Suillus tomentosus

Most common under shore pine and lodgepole pine, and only occasionally found with ponderosa. The yellow cap is covered in fine fibers or scales, and the pores slowly stain blue when bruised.

Mycorrhizal Edible

White King Bolete

Boletus barrowsii

A pale-capped bolete with white flesh and a netted stem. It mostly grows under introduced oaks in towns. Oregon white oak is a less usual partner, and it may also turn up under ponderosa pine on the east slope (Siegel & Schwarz).

Mycorrhizal Choice Edible

Spring King Bolete

Boletus rex-veris

An east-side species of fir and pine forests, with ponderosa among its host conifers (Arora). It begins fruiting a few weeks after snowmelt, often buried in the duff as a “mushrump” before it pushes through.

Mycorrhizal Choice Edible

Morels

Morchella spp.

Burn morels fruit in conifer forest the spring after a wildfire, which includes burned ponderosa stands. They are not known to be mycorrhizal with the trees, and why fire triggers them is not fully understood.

Choice Edible

Photos: Ponderosa Pine — Bob Earle (CC0) · Pine Slipperycap — © Alan Rockefeller, CC BY · Bluing Slippery Jack — © Drew Henderson, CC BY-SA · White King Bolete — © Terri Clements/Donna Fulton, CC BY-SA · Spring King Bolete — © purplecloud, CC BY-SA · Morels — Kari Moreland (CC0).

Sources: Mushrooms of Cascadia (Siegel & Schwarz, 2024); MycoMatch (© Ian Gibson), a compilation of published descriptions through which most other field-guide authors named here are quoted.