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Alnus rhombifolia

Stromatic pyrenomycete with erumpent clusters of unilocular ascomata, apices like phillips head screwdrivers.

Asci 85 x 6 µm, pedicellate, IKI-. Ascospores allantoid, 9–10.5 x 1.5–1.4 µm.

Micrographs 7-10 from Fred Rhoades and micrographs 11-13 from Dave Largent.

Cap width ~2-3 cm; Stipe length ~3-7 cm; Stipe width ~3-6 mm.

Photo 7 - spores 100X
Photo 8- gill trama and spores 400X
Photos 9,10 - pileipellis upright hyphae 400X
Micrographs 11-13 by Dave Largent
Description by Buck McAdoo:
Spores - 6-sided, subisodiametric, 10-13 x 7-8 microns. Q = 1.27
Basidia - Cylindrical-clavate, 2 and 4-spored, 30-36.5 x 9.5-11 microns.
Cheilocystidia - Cylindrical in tufts at 50-57 x 5-8 microns. And one narrowly fusoid at 62 x 11 microns.
Pleurocystidia - None seen.
Pileipellis near margin - A cutis of radially parallel hyphae 8-14 microns wide with some exerted ends, and some intracellular pigmentation.
Subpellis - Of more sinuously parallel hyphae at 4-10 microns wide.
Pileal trama - Of more bloated parallel hyphae at 11-17 microns wide.
Pileipellis at disc - Of parallel hyphae with rounded ends, 10-17 microns wide.
Pileocystidia - None seen.
Gill Trama - Of interwoven hyphae.
Stipitipellis - Of vertically oriented hyphae 5-12.5 microns wide.
Caulocystidia - There were a few small clusters, but upon closer examination they appeared to be exerted ends emerging from inside the outer walls. Cylindrical.
Comment - Probably in Leptonia Subgenus Cyanula

Quercus agrifolia, Arbutus menziesii, Arctostaphylos. Velvety cap. Broadly attached gills. BRIGHT yellow UVF on gills and stipe. Brown KOH reaction on cap. Odor reminiscent of a plant that I seem to recognize as toxic but can't remember the plant from just the odor

On Rosellinia.

Conidiophores monoverticillate; conidiogeonus cells monophialidic, cylindrical; terminal element 36 - 45 x 1.8 - 2 µm.
Conidia hyaline, oblong, (8.9) 9.4 - 12.5 (13.3) × (2) 2.2 - 2.7 (3.2) µm;
Q = (3.7) 4 - 5.1 (5.7) ; N = 30; Me = 11 × 2.4 µm ; Qe = 4.5.

With nectriaceous parasite.
On white fir.

Perithecial wall composed of three layers: 1) outer carbonized layer 33 - 53 µm thick; 2) medullary layer whitish-tan, 23 - 74 µm thick, poorly differentiated; 3) interior layer dark brown, 37 - 50 µm thick, textura prismatica.
Ascus 8-spored, unitunicate, 265 x 20 µm.
Ascospores pigmented dark brown, guttulate, with germ slit nearly the full length of the spore;
(20.9) 21.2 - 24.1 (26.2) × (8.8) 9.2 - 10.4 (10.6) µm; Q = (2.1) 2.14 - 2.5 (2.8) ; N = 30; Me = 22.6 × 9.8 µm ; Qe = 2.3; with gelatinous sheath, thicker at both ends.

Under arroweed and mesquite with washed up debris in wet silty soil, Mojave River bed/floodplain. Cap appearing tomentose when dessicated, with a thick lighter colored band at the margin.

Microscopy: @rudydiaz

Hairs 3.6 - 5.6 µm thick; KOH + purple; UV+ orange.
Asci 89 - 102 x 12 - 13 µm, thick-walled, apex inamyloid.
Ascospores hyaline, smooth, aseptate, elliptical, bent, 16.9 - 19.5 × 5.3 - 7.1 µm, Q = 2.7 - 3.5.

In coast live oak and bay laurel duff. Cap velvety when young, opening into somewhat broad appressed scales. Cap remaining mostly conical. Stipe texture same as cap. Densely matted cobwebby basal tomentum with rhizomorphs extending from the cobwebby material. Gills with pink hue even when young.

Microscopy: @rudydiaz

Rodent digs found throughout the area exclusively under chamise. Manzanita also present, and interior live oak within 100 feet, but digs were only under chamise. Digging revealed that the mycelial mat that truffles were found in and smelled the same dissipated with distance from chamise. Melanogaster also mixed in and more abundant. Parts of the mycelial mat smelled like Melanogaster and parts smelled like these -- distinctly of oil paint. Woodrat nest about 8 feet away.

Odor oil paints.
Asci 1 to 2-spored, balloon-shaped, (91.6) 91.63 - 110.2 × (64.6) 64.61 - 75.37 (75.4) µm (Me = 98.6 × 70.3 µm). Ascospores globose with honeycomb ornamentation composed of ridges 4.5 µm thick;
(36.7) 38.9 - 43.4 (45.7) × (33.3) 35.4 - 42.6 (44.8) µm;
Q = 1 - 1.1 ; Me = 41.7 × 39.6 µm ; Qe = 1.1.