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Found by truffle dog Rye in a monoculture stand of ~40 year old Douglas-fir. Truffle well into the mineral layer of the soil, right at the base of a tree. Aroma mild, sweet, with undertones of cooked vegetables. Pleasant to me, mixed reactions from others. Peridium mottled brown, with variable warts. Gleba firm and marbled.

Microscopy by Noah Siegel.

Flowering and fruiting submerged in the clear deep cold water of the lake.

Comments on the photos by Dr. Gerhard Wiegleb: "the plant does not really look like European R. trichophyllus. the petals are broadly obovate and too wide. R. trichophyllus has narrow lanceolate or spathulate petals which are not contiguous during anthesis.
The regular shape of the submerged leaf strongly indicates a membership to the R. circinatus group. while in euro-westasian R. circinatus the capillary segments are rigid and are strictly lying in one plane, in amphi-pacific R. subrigidus the capillary segments are subrigid (!) and not in one plane (slightly 3-dimensional). R. trichophyllus has submerged leaves which are subrigid to flaccid, which are always longer than wide. The nectar pits (in the photo) are trough-like with an apical extension, not really pyriform but rather triangular. This is typical for R. subrigidus……. Both R. circinatus and R. trichophyllus have lunate nectar pits."

Truffle dog found three in one area, two growing gregariously. Truffles were found close to the surface, growing among rocks and organic matter. Douglas-fir forest, mixed age. The truffles have a very pleasant, sweet aroma. Not overpowering, but with a presence. Somewhat reminiscent of a ripe apple. Peridium smooth, dull yellow, hymenium velvety with a pink/reddish hue. Spores bright yellow, 8 per ascus.

Seems to match description of H. variiformis, except for the distinctly pink hymenium.

Mild, almost unnoticeable odor. Found by truffle dog close to duff layer. Overstory forest composed of young Douglas-fir, with some young incense cedar scattered around. Understory predominately bare, with a few patches of sword fern. Soil moist but not wet.

Mild, pleasant odor, perhaps somewhat garlicky. Found by truffle dog. Overstory forest composed of young Douglas-fir and incense cedar. Understory predominately bare, with a few patches of sword fern. Soil moist but not wet. Some mossy patches around, but the truffle was not found under moss.

Mild odor, not unpleasant, unremarkable. Found by truffle dog. Overstory forest composed of young Douglas-fir and incense cedar. Understory predominately bare, with a few patches of sword fern. The truffle was found growing near/within decomposing branches underground. It was exceptionally dense and solid when pressed. Peridium peeling/covered in fine mycelium.

Found by truffle dog in a Douglas-fir forest (stand age maybe ~50 years) with scattered sword ferns in the understory. Ground covered in sticks and twigs, soil relatively dry. Aroma not intense, somewhat mellow and organic.

Found by truffle dog in a Douglas-fir forest (stand age maybe ~50 years) with scattered sword ferns in the understory. Ground covered in sticks and twigs, soil relatively dry. Aroma strong and intrusive, could compare to burnt rubber/industrial glue.