These specimens (3) were found fruiting out of a road-cut, under Douglas-fir, Noble fir, Western hemlock and White pine. There are no known Eucalytus species which can tolerate the extreme differences of temperature at this 4,000 foot elevation site. In fact, most Eucalypts species are not hardy in Portland, and seldom survive more than 5 years.

All of the photos here are of one specific fungus, which was about 6 inches above ground, and 6 inches below ground. The below-ground area is especially interesting in cross-section, as it is mostly citrine yellow. The base was even more so.

While many of the trees in this area are old-growth (300+ years old) there are some seedlings. Oddly the closest plant to the sporocarps was a Golden chinquapin (Chrysolepsis chrysophylla), which acts as an understory at this elevation, and rarely exceeds 6 feet in height.


Both brown and citrine yellow rhizomorphs are present.
Close-up of torn base of Pisolithus, showing amber exudate droplets. When sliced, the same base shows blackish-goo.
Close-up of a sliced and torn section of the base. Where sliced (left), area closest to the peridium shows black. But area where my knife didn’t reach (i.e. deeper than 3 inches) shows mostly citrine-yellow area, with interesting hollow areas (vacuoles?).
Peridioles are clustered near the center of the upper half of the sporocarp, with citrine-yellow areas in the rooting structure. Peridioles eventually turn black (where sliced) or have a thin-coating of white or off-white color, embedded in a orange to yellow matrix.
8-inch specimen, showing cut surface (purple-black-blue-dark red) and citrine yellow area where specimen was pulled apart. Vugs (holes) seem to form around rocks and other hardened objects, but small vugs appear for no reason. Ruler at top is transparent blue.
Other side of sporocarp, showing largest vug (3/4 inch) where I found a 1/4 inch rock, and several small vugs lower down the pseudostipe. Not papery peridium still adherring to top, between 2-3 inch markings on ruler.
Upper portion of sporocarp showing top 2.5 inches already a powdery spore mass with no peridioles visible. Some fibers in spore mass visible. Lower pseudostipe shows black, red, purple and bright yellow colorings.
Bottom 5 inches of pseudostipe obscurred by powdery spores. Pseudostipe removed via a combination of cutting from the side and lifting. Some fibers still visible.
Upper 3" of outer portion of sporocarp, showing some peridium (lower portion of photo) and brown spore powder under ruler.
Freshly cut portion of sporocarp, near top. Colors include maroon, black, purple, yellows, brown spores and gray soil remnants.
Close-up of bottom of spore-producing layer (brown top), and non-spore layer underneath, still showing some peridioles (blue, center bottom) and dark red-black (right side under brown spore mass) still showing some residual peridiole pockets.

Proposed Names

47% (3)
Recognized by sight
Used references: Orson K. Miller Jr., Mushrooms of North America.
50% (3)
Recognized by sight: Still doubtful we can put names on these, even if there is no Eucalyptus…

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
By: Daniel B. Wheeler (Tuberale)
2014-10-17 15:47:45 CDT (-0500)

Will be adding 7 new photos shortly.

Measured 2 specimens (not previously photographed) today. Largest was 10 inches tall. Shortest (and most massive) was 8 inches tall and 4 inches diameter at base. Most seem to have matured overnight. Have feeling that where they were found has something to do with rapid maturation. Area probably had near-freezing temperatures yesterday, although by the time I arrived (10:15am) temperature had already risen to nearly 50 degrees F.

Bright yellow stems still present, although there was a lot more red in the stem today. Almost all peridioles gone in gleba, except very low down. Powdery mass on top now reaches 2.5 inches into the sporocarp. Lots of spore production. Probably enough to innoculate 5 square miles at 212 spores per tree, which is suggested at one on-line site. (I got that much on my little finger, which had the least amount of dusting.)

At least 10 inches, at least.
By: Daniel B. Wheeler (Tuberale)
2014-10-17 01:46:57 CDT (-0500)

Will have to buy a ruler tomorrow and place it near the sporocarps while photographing them.

Did you see pockets in the sectioned sporocarps? Some of these pockets were nearly an inch across. Had I not photographed them because of their size, I’m not sure I would have caught the exudate droplets.

Yellow root structures may be a function of age. Younger sporocarps may have more pronounced yellow. I had hunted this area 4 days prior, and not seen these. Now I almost tripped on them.

While the nearest shrub was Golden chinquapin, I don’t think it was large enough to host all three sporocarps. There was a large Douglas-fir about 6 feet away which would seem to be a better host source for this much size. Tree was maybe 150 feet tall, and at least 2 feet in diameter.

Little black when sliced open, but black didn’t appear immediately. Bright yellow color may have been caused because I had to pull the sporocarp in half. I had just purchased a new knife for the day, and it only had a 3-inch blade. I thought the sporocarp would burst before it broke open.

Sizes, exudate, yellow, black
By: Jacob Kalichman (Pulk)
2014-10-16 23:31:38 CDT (-0500)

Over a foot tall, wow! The longest I’ve seen was probably about 8".

Lately I’ve been trying to extract fb’s with the root intact, it’s felt like I’ve been getting the whole thing. Usually not incredibly long. Largest root:sporocarp ratio was in obs 180278, I think.

Red/orange exudate not uncommon IME. Didn’t see it in either of the pockets, though.

Astonishingly bright yellow roots, very common IME.

Looks/sounds like there was little, if any, black in the interperidiole matrix, is that correct? Every fb I’ve looked at has had an essentially black matrix.

These sporocarps were very fresh, Jacob.
By: Daniel B. Wheeler (Tuberale)
2014-10-16 23:18:46 CDT (-0500)

No hint of parasitic mold on any. They were also quite large: all three were over a foot tall.

This is the first time I have seen what would be called vugs (holes on the interior) of Pisolithus, and the first time I have also seen amber exudate on the inside of those vugs.

I guess I should open the other two tomorrow, and see if they have the same features.

I cut these off in order to get them up. I left quite a bit of root-like base still in the ground, deeply rooted and VERY bright yellow. I’m not sure which feature I was more surprised to find: the yellow base, the amber exudate within the interior holes, or the size of three sporocarps in close proximity to each other. I’m beginning to question just how deep these critters go.

Large hollow areas inside fb
By: Jacob Kalichman (Pulk)
2014-10-16 23:00:22 CDT (-0500)

Interesting.. I’ve seen it twice (second time was today, actually), and both times it was inhabited by a mold. Not sure if that caused them, though…