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This fungus infects Box elder (Acer negundo) and turns the twigs white, killing them. Sometimes the fungus looks like broken up black circles (see photo 1), a bit like cheetah spots, and sometimes it looks like complete circles. I have seen similar Box elder twigs with this fungus, where part of the pale twig was an orangish pink hue.

After letting the twig sit in a moisture chamber, pinkish goo started to ooze out of the black circles. I believe this is an anamorph of some Ascomycete. A photo of the conidia at 1000x is shown. The spores are elliptical / pill shaped and have numerous round guttules in them.

Previous observations:
https://www.inaturalist.org/observations/200536858
https://www.inaturalist.org/observations/196420044
https://www.inaturalist.org/observations/194669917
https://www.inaturalist.org/observations/157445322
https://www.inaturalist.org/observations/151691625
https://www.inaturalist.org/observations/151691465
https://www.inaturalist.org/observations/148312162
https://www.inaturalist.org/observations/144672964
https://www.inaturalist.org/observations/110823238
https://www.inaturalist.org/observations/110170481

Growing on Pinus rigidus needles that fell down in a swampy area. Pine Barrens. Biggest cup was 5mm in diameter, and very thin, like a flat lentil. Asci 98-123 x 7.4-9.8 um. Spores 11.1-14.8 x 4.9 um. Paraphyses show twisted, branched, curly and straight ends, around 2.4 um wide.

Growing on a curled Rhododendron catawbiense leaf. Ascocarps up to 0.7 mm wide; fringed with tufts of hairs; sessile. Ascocarps seated individually on small, white, membranous subicula. Not noticeably bioluminescent. Not noticeably fluorescent under UV light. Hair tufts composed of fascicles of smooth, hyaline hairs. Asci inoperculate and 8-spored with amyloid apical apparatuses. Spores hyaline, smooth and 3-septate. Spore measurements: (16) 17.1 – 20 (21.3) × (3) 3.2 – 3.8 (4.1) µm; Q = (4.4) 4.5 – 5.8 (6.2); N = 30; Me = 18.2 × 3.6 µm; Qe = 5.2

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Originally posted to Mushroom Observer on Aug. 22, 2023.

in the sand and gravel beside a road/ three at different stages/ this one: cap 7.1 cm wide, stem narrower at apex 1.3 cm to 1.5 cm at base/ gills have a pinkish hue/ spore print: cream/ when fresh no odour, while drying ti, quite a strong & unpleasant odour/ spores: ellipsoid and unigutulate/ 9.8 - 10.8 x 6.1 - 6.4 microns

Fire pit. Microscopy. Ascospores approx. 15.0-17.0 x 7.9-8.8. Q=1.9. Multi-septate rounded ended hairs, some longer than 100µm; paraphyses greenish in iodine - many forked. (FBs were bright yellow-orange, which my camera has trouble picking up, so I had to pump up saturation to make them closer to their actual colour.) Vouchered. JET230703_02

ID help appreciated.
iNat was very consistent in its top suggestion: Stalked Hairy Fairy Cup (Lachnum virgineum).
Totally love that name. I didn't see stalks, but they were so tiny who would know?
I backed up a couple of taxon levels as a starting place.

On burnt ground, dominaing but interdispersed with Anthrocobia sp. Unigutulate round spored reddish orange apothecia

(13.9) 14-15.3 (16.1) x (13.7) 13.7-15.3 (16)

N=23
Me = 14.7 x 14.6um
Qe =1.01

asci 206.3-216.2 x 15.5-18.8 um

On Tuilp Poplar bark in mature hardwood forest. Continuous white thallus, black lecideine apothecia well above the thallus. K-, C-, UV-. Spectacular big golden muriform spores, turning dark brown with maturity. 8 per ascus.

Growing on Odocoileus virginianus dung with Saccobolus minimoides observation 423523, Coprotus glaucellus observation 423498 and Coprinopsis sp. Subiculum absent. All Structures inamyloid. Hairs multiseptate and hyaline. Single polysporous ascus per ascocarp. Spores smooth, hyaline and eguttulate. Spore measurements: (8.9) 9.1 – 9.8 (10) × (6.9) 7.1 – 7.5 (8) µm, Q = (1.2) 1.23 – 1.37 (1.4); N = 30, Me = 9.4 × 7.3 µm; Qe = 1.3