Cap-7.5 cm across. Disagreeable odor kind of like rubber.
Convex fibrillose pale-brown/dull-yellow caps, 2.5-3.5cm across with an inrolled margin. The fibers on the cap appear as a darker brown. Closely-spaced yellow adnate gills appearing in 3 series. Orange stipe 7-8mm long, hollow with slightly fibrilose interior appearing yellower than the rest of the context, lacking any evidence of a cortina or other partial veil, appearing bleached white near the gill connection point and yellow at the base of the mushroom (yellow coloration extends through the rest of the "root" created by growing through the bark). The stipe also has a streaked texture, with the lines being brown to dark red-ish. Basal mycelium white. Spores not appearing on white paper, so I cannot confirm for now but assuming white spores. Stipe also had a streaked texture similar to wood grain. Growing in mixed conifer forest. No notable staining or odor (other than "mushroomy").
Originally thought Tricholomopsis decora, but it seems this has finer fibrils rather than what I would say are squamules. The paper "Tricholomopsis (Agaricales) in the Western Hemisphere" (https://www.jstor.org/stable/2805334) has a decent key, but it seems that beyond the spot I reach in the key requires microscopy (point 11). So, this is my best guess for now.
LWP -- one of two new Little White Porcini in southern Arizona. I just noticed the small dark red gilled mushroom attached at the base -- this could be happenstantial or possibly some association. In any case, I disregarded it, and am slowly learning to question such assumptions...
DMF 9 on well decayed oak Hollowing snappable stem FR42B
DNA sequenced
on cottonwood near the San Pedro River
or Leccinellum cf. viscosum
Leccinellum also appears to be polyphyletic.
previously, based on ITS Blast: Leccinum cf. violaceotinctum
Was growing on ground in oak forest. I am sorry that I did not obtain photos of the gills.
On leaf, on downed wood next to oak
Prunus serotina substrate, 6070' elevation, montane riparian canyon bottom
under Juniperus deppeana. Small pinus close by.
scent - slightly spermatic
This was a piece of horse manure with white hyphae. I put it in a humid chamber for a month to see what the fruiting bodies would look like.
slow blue stain. Found in a well covered wash with Quercus close by.
Emerging from Quercus leaf duff. Many coming up at the edges of rocks
Pink gills when young, odor spermatic but not strongly so. In soil under Quercus arizonica
orangey-red staining, ornamented stipe and partial veil margin
Rhizomorphs present.
In duff of Quercus (Q. arizonica? and alligator juniper).
bioluminescent
Under oak and pine. Unpleasant odor.
Section Lepidella
Growing from cow dung
Under doug fir and ponderosa pine. Strong almond/marzipan odor.
Growing from cow dung
Found in well decayed aspen wood at 9000 to 9500 meters elevation. Photographed very near the type locality.