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On standing dead aspen that had recently lost its bark. Microscopy. Vouchered. See also https://www.inaturalist.org/observations/36946568
I'm linking to other probable or possible observations below in comments.
I also wrote a blog post about it: https://weirdandwonderfulwildmushrooms.blogspot.com/2023/11/its-bird-its-plane-no-its-pyrenomyxa.html

Aerially rhizomorphic; suspended from twigs and enveloping leaves on shrubs of the understory. Fruiting bodies present, minute. Hymenium white, smooth, alamellate. Pileus tan with a minute black papilla. Stipe wiry, black, similar to rhizomorph.

Black perithecia with black tri-forked appendages on the outside. The appendages can be seen best on the first picture. Growing on bark of tree that fell over a stream, but not touching the water. Some c.f Cosmospora is present as well, which is how the specimen was initially spotted.

Erumpent on a dead Salix stick under peeling bark. Asci inoperculate, unitunicate, thick-walled, inamyloid, and 8-spored. Spores hyaline, smooth, and 3-septate at maturity. Spore measurements: (14.6) 15.9 – 19.3 (21.1) × (2.5) 2.7 – 3.5 (4) µm; Q = (4.4) 5 – 6.6 (7.3); N = 30; Me = 17.5 × 3.1 µm; Qe = 5.7

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Originally posted to Mushroom Observer on Aug. 23, 2023.

Found two specimens ~1m apart in a large Rhododendron - one (pictured) gripping the underside of a branch and the other (not pictured) gripping the edge of a leaf. Specimens sent with João Araújo to NYBG

host attached to underside of fallen tree (at least 30 cm diam, corticate) bridging stream. receiving lots of moisture from splashing water beneath. apparently entirely anamorphic. same log as RLC1390 (Observation 252366) and RLC1493 (Observation 252423)

Host: unk. insect (urticating?)

Habitat: Northwest Andean montane forest (NT0145)

Collector(s): D. Newman & R. Vandegrift

Collection #: RLC1285

Photomicrography and molecular data forthcoming

also seen here:

http://mushroomobserver.org/293386

Please forgive the very crude macro photo, taken just for reference. The micrographs may be equally uninformative, but they represent some of the only structures of significance I have seen when scoping this... organism, which may be "in the neighborhood of Coccomyces" according to a years-ago theory of Jason Karakehian, or may be something else entirely, perhaps not even fungal.

peach/orange form? tasted distinctly like butter!

Substrate: unidentified downed, partially corticate, irregularly decomposed log by river. growing from beneath cortex, white rotted, ~20cm diam.

Habitat: riparian “Tucumano-Boliviano” alder forest (Alnus acuminatus)

Ecoregion: Bolivian Yungas (NT0105)

Collectors: D. Newman, P. Kaishian, D. Ettlinger, I. Cuba Pinto, T. Padilla Albis, A.I. Echeverría Rojas, M.Á. Centellas Levy, N. Gonzales San Miguel, P.A. Angulo Salazar, S. Ochoa Bustillos & A. Sandoval

Collection #: SEHU004

Collected during the 2nd Expedición Micológica de la Sociedad Micológica de Bolivia, with support from Eduardo Morales and the Herbario Criptogámico of Universidad Católica Boliviana San Pablo (UCBSP).

Specimens collected, transported, deposited, duplicated, exported and DNA sequenced with the express, written permission of the Ministerio del Ambiente, Agua y Transición Ecológica (MAE) and the Instituto Nacional de Biodiversidad (INaBio), in compliance with the Nagoya Protocol. Copies of permits available to select parties upon request.

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Image #1:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
4.0 sec, f/8.0, ISO 400
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (10 Images)
Image #2:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
4.0 sec, f/8.0, ISO 400
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (7 Images)
Image #3:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
0.3 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (13 Images)
Image #4:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
0.3 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (23 Images)
Image #5:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1.0 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (10 Images)
Image #6:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1.0 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (21 Images)
Image #7:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
2.5 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (8 Images)
Image #8:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1.0 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (15 Images)
Image #9:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1.0 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (14 Images)
Image #10:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1.0 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (8 Images)
Image #11:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1/5 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (31 Images)
Image #12:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
0.4 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (11 Images)
Image #13:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1/5 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (7 Images)
Image #14:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1.0 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (8 Images)
Image #15:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
0.5 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (6 Images)
Image #16:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
1/5 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (10 Images)
Image #17:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x
0.6 sec, f/8.0, ISO 200
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (18 Images)

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Additional specimens not added to iNat observation fields:
Herbario Nacional del Ecuador: RLC1672

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—MO custom fields—

Comments: note those FBs with yellow apothecia possess exclusively white hairs, while those with orange to red apothecia possess bicolored hairs (white and yellow). all individuals suspected to belong to the same taxon. this species the subject of ongoing study with Dr. Luis Quijada of the Pfister Lab. microcharacters place it evenly between Belonidium and Trichopeziza, with encrusted hairs that turn purple in KOH. Also known from Panama. full micromorphological workup forthcoming. compare with RLC1698

Originally posted to Mushroom Observer on Feb. 14, 2022.

Collected beneath the same tree as my other observation of this same species- https://www.inaturalist.org/observations/171660035
Seems to be prolific among the magnolia duff but does not appear to be infecting any other duff present.

A still unknown, white spored, always solitary agaric, nicknamed “La Princessa” in 2012 by Bolivian mycology student, Elizabeth Melgarejo. Note the pinkish marginate gills and faint reddish staining on stipe surface where handled. The best guess on this has historically been Agaricaceae.

Substrate: solitary in sandy soil

Habitat: secondary lowland tropical rainforest, regularly subject to landslides and some human disturbance. adjacent to golf course and horse pasture.

Ecoregion: Southwest Amazon Moist Forests (NT0166)

Collectors: D. Newman, P. Kaishian, D. Ettlinger & T. Padilla

Collection #: CHOC038

the most gregarious example of this species observed yet. growing singly but numerously in a roughly 10×10 meter area.

Substrate: in soil

Habitat: lowland tropical rain forest

Ecoregion: Southwest Amazon Moist Forests (NT0166)

Collectors: D. Newman, I. Cuba Pinto & P. Kaishian

Collection #: CHAL135

Collected during the 2017 SUNY-ESF Fungi of Bolivia Field Course & 2nd Field Workshop on Neotropical Polypores

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Originally posted to Mushroom Observer on Apr. 22, 2022.

this is the most beautiful Mycena s.l. I have ever seen. view images at original size to truly appreciate the detail in this exquisite design. checked for bioluminescence (negative).

Substrate: on small twigs

Habitat: montane to high-montane, humid, secondary mountain forests

Ecoregion: Bolivian Yungas (NT0105)

Collectors: D. Newman, P. Kaishian, L. Deininger, D. Ettlinger & T. Padilla

Collection #: APA018

color recorded as 5B7, which would make the studio photos more accurate. I remember this having a pretty firm consistency.

Substrate:

Habitat: dry semideciduous forest [Curupaú (Anadenanthera colubrina) / Motacú (Attalea phalerata) / Bamboo (Chusquea spp.) / Bibosi (Ficus sp.)]

Ecoregion: intersection of Chiquitano Dry Forests (NT0212) and Cerrado Savanna (NT0704)

Collectors: D. Newman, I. Cuba Pinto, E. Melgarejo Estrada, D. Camacho Ramirez & S. Montaño Poquiviqui.

Collection #: DSN12.247 (SS39)

compare with JuDe048 (Observation 296484) & RLC1532 (Observation 269366)

Substrate: in sandy soil. long rooting structures possibly attached to roots.

Habitat: tropical dry forest adjacent to pasture/savannah

Ecoregion: Chiquitano Dry Forests (NT0212)

Collectors: D. Newman, P. Kaishian, D. Ettlinger & T. Padilla

Collection #: JuDe022

compare with RLC1532 (Observation 269366) & JuDe022 (Observation 269366)

specimens excavated well beneath the surface of the soil and fallen palm fronds in which they were nestled. radicating bases tapered thinner and thinner to the point of being unable to be handled without breaking. many rootlets present in the soil, intertwined with the bases of the fungus, though not necessarily attached to them. no perithecia initially observed until further analysis during megamacro photography. whitish-yellowish covering assumed to be conidia. no other color scheme observed, even in rotting, presumably older material from the same cluster. consistency distinctly non-carbonaceous, more firm fleshy.

Substrate: presumed to be parasitic on roots/rootlets beneath the soil.

Habitat: tropical dry forest adjacent to pasture/savannah

Ecoregion: Chiquitano Dry Forests (NT0212)

Collectors: D. Newman, P. Kaishian, D. Ettlinger & T. Padilla

Collection #: JuDe048

i have never seen a fungus like this before; tiny apothecia tightly aggregated into concentric zones on the undersides of a living leaves. totally stumped and in awe.

Substrate: living leaves (sp. not recorded)

Habitat: mid-elevation cloud forest, ~2300m

Ecoregion: Bolivian Yungas (NT0105)

Collectors: D. Newman, I. Cuba Pinto & E. Melgarejo Estrada, G. Chávez Cosio, M.E. Zeballos, L.L. Moya Ramallo, A.I. Echeverría Rojas, E.I. Llanque Mamani, A.M. Flores & M. Canaza

Collection #: DSN12.104

Collected during the 1st Expedición Micológica de la Sociedad Micológica de Bolivia, with support from Eduardo Morales and the Herbario Criptogámico of Universidad Católica Boliviana San Pablo (UCBSP).

Substrate: on branch immediately adjactent to an insect gall

Habitat: dry semideciduous forest [Curupaú (Anadenanthera colubrina) / Motacú (Attalea phalerata) / Bamboo (Chusquea spp.)]

Ecoregion: intersection of Chiquitano Dry Forests (NT0212) and Cerrado Savanna (NT0704)

Collectors: D. Newman, I. Cuba Pinto, E. Melgarejo Estrada, D. Camacho Ramirez & S. Montaño Poquiviqui.

Collection #: DSN12.222 (SS14)

Image #1:
Canon EOS 6D + Sigma 50mm f/2.8 EX DG Macro
1.0 sec, f/8.0, ISO 400
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (23 Images)
Image #2:
Canon EOS 6D + Sigma 50mm f/2.8 EX DG Macro
1.0 sec, f/8.0, ISO 400
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (23 Images)
Image #3:
Canon EOS 6D + Sigma 50mm f/2.8 EX DG Macro
1.0 sec, f/8.0, ISO 400
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (16 Images)
Image #4:
Canon EOS 6D + Sigma 50mm f/2.8 EX DG Macro
0.4 sec, f/8.0, ISO 400
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (7 Images)
Image #5:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/180 sec, f/11, ISO 100
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (2 Images)
Image #6:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/180 sec, f/11, ISO 100
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (2 Images)
Image #7:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/180 sec, f/11, ISO 100
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (4 Images)
Image #8:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/180 sec, f/11, ISO 100
Color Corrected w/ X-Rite ColorChecker Passport
Focus Stacked with Zerene Stacker (5 Images)

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—MO custom fields—

Comments: a beautiful mycoheterotroph. This is probably T. panamensis, the one common and widespread member of the genus in the Neotropics. The rest are exceedingly rare.

Originally posted to Mushroom Observer on May 27, 2019.

Originally I had no idea what this was. I thought it was a cordyceps as it has erupted from the body of a katydid or grasshopper. Someone has suggested pin mold, another has suggested slime mold.
Found positioned on a decaying log in subtropical rainforest next to a creek. We have recently had lots of rain and high humidity.

Via a cordyceps identification page on Facebook, Nigel Hywel-Jones commented "It is indeed spectacular, and rare. In 35+ years and over 20,000 collections in 12 countries I have found it once. On an adult moth. That is how rare it is. It is in the genus Sporodiniella and is a Zygomycete. It looks similar to Sporodiniella umbellata."

So I have now listed it as such.