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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...