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Growing in wet mixed duff. Some appeared to be emerging from Redwood needles, but difficult to determine. The first image shows some that were emerging from a rotten Rhododendron (?) twig. Other options are California-Bay Laurel (Umbellularia californica) and Coast Live Oak (Quercus agrifolia) leaves.

HRL3268. Cap 15-27 mm. Spores 7-10 x 3-3.5 um, inamyloid, smooth, cyanophilic. Basidia 4-spored, without siderophilic granulations. Cheilos and pleuros absent. Pileipellis a cutis. Clamp connections in all tissues

common locally, grow usually from Late-March to Early May on rotten wood.

produce sclerotia and not nectrioid perithecia despite the appearance, preliminary sequences done a few year ago suggest affinities with Sistotrema species, but I want to retry again...

I'm calling this remarkable fungus Sarcodontia amplissima. I noticed a resemblance to Radulomyces copelandii, but I knew it couldn't be that because of the vivid color—yellow with a slight greenish cast and areas of reddening. It had an intense, unpleasant odor that was apparent from a distance, but I wasn't sure it was coming from the fungus initially. When I smelled it at close range, I ascertained that the odor, which brought to mind wet plywood and sour towels, was indeed coming from the fungus—but at close range there was an additional, more pleasant component that I couldn't put a name to. Descriptions I have found mention fruitiness and unpleasantness.
I've been trying to unravel the taxonomy of this species—a number of names have been bouncing around with some conflicting ideas about synonymy. This 2021 research seems to have sorted the mess pretty well: https://www.fs.usda.gov/nrs/pubs/jrnl/2021/nrs_2021_nakasone_001.pdf
According to the findings of this research, the European species which closely resembles my find should be called Sarcodontia setosa. The name Sarcodontia crocea has often been used for finds resembling this, but that is apparently "based on an erroneous concept of Sistotrema croceum." The latest name for that species is Noblesia crocea—but it is apparently quite different from Sarcodontia amplissima and S. setosa.
The substrate was largely decorticated, and I was uncertain of its identity—but after researching the fungus, Malus (apple) seems plausible based on the shape of the limbs and the residual bark.

Caps grey with a hint of olive. Stems coated with an easily collapsed/discolored vesture.

No smell. Taste faintly oily at first; after 3-5 sec becoming distinctly acrid.

In moist soil poking out from underneath strips of loose dead hardwood bark.

Hornbeam, cherry, white oak, maple, sweetgum, elm, beech.

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Additional notes for sequences (bases on the right):

ITS: Sequenced by Chance Noffsinger

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Originally posted to Mushroom Observer on Oct. 29, 2021.

On forest floor/litter under mature Tsuga in an old-growth Eastern hemlock stand.

Basidiospores (3.8) 4.2 - 5.4 (5.5) × (3.2) 3.4 - 4.2 (4.4) µm;
Q = (1.0) 1.1 - 1.4 (1.5) ; N = 20.
Me = 4.7 × 3.8 µm ; Qe = 1.2

Pileus: 0.5-1.0 cm wide, light brown, planar convex becoming depressed, glabrous, hygrophanous, margin incurved becoming uplifted and undulating, margin darkening in age
Lamellae: pinkish white, decurrent, subdistant to distant, edges sometimes becoming dark pink to dark brown, occasionally forking, lamellulate
Stipe: 1-2 cm tall, 0.1-0.3 cm wide, light pinkish brown, smooth, terete, equal, sometimes flexuous
Odor: insignificant
Taste: not sampled
Habit: gregarious
Substrate: soil with moss
Habitat: lakeside open space with moss and grass near a hardwood forest dominated by Populus trichocarpa
Elevation: 15 m
Basidiospores: elliptic, apiculate, smooth, measuring (7.3) 7.9 - 9.6 (11.3) × (4.2) 4.4 - 5 (5.1) µm, Q = (1.6) 1.61 - 2 (2.3), N = 30, Me = 8.6 × 4.7 µm, Qe = 1.8

Growing on a well-rotted hardwood log in the floodplain of a small creek. Pileipellis composed of brown, thick-walled, roughened cellular elements. Pleurocystidia absent. Cheilocystidia hyaline and filiform. Spores brown, smooth and with a small germ pore. Spore measurements: (6.2) 6.9 – 8.3 (9.2) × (3.6) 3.7 – 4.5 (4.7) µm, Q = (1.6) 1.7 – 2 (2.2); N = 30, Me = 7.6 × 4.1 µm; Qe = 1.9

Fruiting on dead northern white cedar (Thuja occidentalis) on Black Duck CoveTrail, near Lubec, Maine.
According to Index Fungorum, the current name is Oxyporus cuneatus. However inaturalist is using Rigidoporus cuneatus.

Growing from standing angiosperm log in disturbed forest near stream. Pores about 6-8/mm. Pilei reduced and never well formed from other examples I’ve seen, imbricate. Skeletal hyphae of trama conpicuously encrusted, no cystidia or clamps identified. Globose elements present in hymenium appear to basidioles. Spores ellipsoid, about 5×3, hyaline in H20. Large and small rounded, free crystals appear to be present in hymenium (h20). Elements inamyloid. Globose, yellowish slightly thick walled and faintly echinulate chlamydospores may be present in context (artifact?). Skeletal hyphae dominant in context, long, unbranched, interwoven. No clamps or septa observed (generative hyphae not observed).

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Image #2: Context
Image #3: Context
Image #4: Encrusted skeletal hyphae (trama, H20)
Image #7: Context hyphae (KOH)
Image #8: Spores 1000x H20
Image #9: Spores (H20)

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Originally posted to Mushroom Observer on Jan. 29, 2021.

A-3049
Collector: Cara Coulter

Spore Sizes:

(8.5)8.5-12.5 x (3.5)2.86-4.32 µm

38 spores measures from mature fresh specimen.

Specimen:
3.5cm to 2cm in length
Cap Size: .4-.6cm

Coloration:
Cream colored cap with gradual transition about halfway down the stipe to a darkened brown foot

Specimen found growing on log that was submerged in water. Half of the specimen's stipe was under water.

Habitat: Inundated sphagnum area with a mix of Hemlock, Birch, Maple and Rhododendron