Favoritos de andrewcannon

On a Physcia species, probably (by local abundance) Physcia stellaris.

On the far left in the 2nd photo.

3rd photo, just right of center - a stalk arises from an apothecium

Reference: Flora of Lichenicolous Fungi, 2022, page 298.

On Buellia stillingiana, which is looking the worse for wear.

Reference: Flora of Lichenocolous Fungi, 2022, p. 306 :

"Cyphobasidium buelliicola Diederich & W. R. Buck,
sp. nov.

Diagnosis : Characterized by the waxy-gelatinous, orange-brown, pulvinate basidiomata, 0.2–0.45 mm diam., developing on Buellia stillingiana, the elongate ellipsoid probasidia, often with a stalk-like base, 18–32 × 5–8 μm, the cylindrical, 3-sep- tate meiosporangia, 30–40 × 4–6 μm, the cylindrical to subuliform, 1.5–2.5 μm thick and 5–7.5 μm long epibasidia, and the ellipsoid basidiospores, 5–6 × 3.5–4.5 μm."

On Java water-dropwort (Oenanthe javanica)

Possibly Uromyces lineolatus, which has been reported on Oenanthe aquatica.

https://bladmineerders.nl/parasites/fungi/dikarya/basidiomycota/pucciniomycotina/pucciniomycetes/pucciniales/uredineae/pucciniaceae/uromyces/uromyces-lineolatus/

Thousands of tiny dark oblong dots, mostly connected to blobs of fungus on a rose leaf. The entire dark colonies of about 100 dark dots are each about 0.4mm across. The individuals not in colonies weren't visible to my naked eye. So these dots are small, maybe 1/20th of a mm (50µm).

On a dead branch of hardwood. This is some kind of hyphomycete (is it synnematous or pycnidial?). The fourth photo shows a section through one of the fruiting bodies showing conidiospores developing in a chamber embedded in the wood which travel up the neck through a rather broad channel to the apex of the neck which protrudes from the bark.

Conidiospores:
Hyaline with oil droplets, ellipsoid, smooth, aseptate
8.6-12.5 x 3.8-4.9µm
Q=2.0-3.0
N=33
Me=10.3 x 4.2µm

Microscopy done- will update with that.

Goopy, but with some form, semicircular, up to 6mm across.

Microscopy in H20
Conidia: Subglobose to elliptic.
(3.4) 3.6 - 4 (4.5) × (2.5) 2.7 - 3 (3.4) µm
Q = (1.2) 1.3 - 1.4 (1.5) ; N = 15
Me = 3.9 × 2.9 µm ; Qe = 1.3
Conidial Hyphae: 1.91-2.9um wide.

I could not access the type descriptions to see if this matched the species, but found this int he 2018 paper by Viacheslav
"A preliminary overview of the corticioid Atractiellomycetes"

"Helicogloea eburnea is closely related to another asexual
species of the genus, H. compressa (see above). Morphologically,
they are evidently indistinguishable but differ in their DNA
sequences and geographic distribution."

The description of the apparently indistinguishable H. eburnea is here.

Sporodochia pustulate, gelatinous and soft, white
semitranslucent; separate pustules up to 1 mm diam and 400
µm thick, partly coalescing, in herbarium shrinking to a thin,
waxy, yellowish film. Internal hyphae with thickened (up to
0.3–0.5 µm) walls, 1.5–2.5(–3) µm diam. Surface hyphae thin to slightly thick-walled (wall 0.1–0.3 µm thick), 1.5–2 µm diam.
Conidiophores irregularly branched, branches generally parallel
to the main axis. Conidiogenous cells cylindrical to slightly
obclavate, straight or curved, tapering to the apex, with multiple indistinct annellation scars at the top, 12–34 × 1.5–2.6 µm.
Conidia subglobose to ellipsoid, smooth, hyaline, slightly thickwalled, (2.8–)2.9–3.7(–4) × (2–)2–2.6(–2.7) µm (n = 30/1).

Measurements of this obs. on all accounts are at the top range or larger than what is reported here.

On leaves of Erythronium americanum, with Vankya heufleri (https://www.inaturalist.org/observations/208696306). The coloration is strange and I have no idea what it is. The spheres, viewed under 800x, could burst open and release its content.

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