המועדפים של andrewcannon

Aecidies sur Lycopus uniflorus. À proximité, Scirpus cf. pedicellatus avec des télies sur les feuilles séchées de l'année dernière.

Avec @m-bibittes
Spécimens: Léveillé-Bourret & Garon-Labrecque 1437 (CMMF) [I,II ex Lycopus uniflorus]
Léveillé-Bourret & Garon-Labrecque 1438 (CMMF) [IV ex Scirpus cf. pedicellatus]

Abundant large telia, hypophyllous (maybe amphigenous) on Solidago. Puccinia stipae stand out as a possibility among the Puccinia spp. that grow on Solidago, since the teliospores are relatively wide.

Measurements
Teliospores
40–52×24–26 μm
Urediniospores
23–26×20–22 μm

Images
Slides in KOH
2: Teliospores
3: Urediniospores
4: Possibily basidiospores, otherwise extraneous

On Morella sp., prev obs
Whoa! the USDA Fungal databases only list ONE species of fungus affecting Morella sp, and it's not a rust. I can't find any info about rusts on Morella at all :-O*

*granted, I looked for only like 3 minutes... but that's usually enough to give me SOMETHING.

Orange coating on ellipsoid/spheroid growths on Clematis stems, possibly Clematis virginiana.
Micro is at 400x. One photo shows powder (presumably spores) dropped only a slide; other photo is a smash-mounted sliver of the ellipsoid/spheroid growth.

On hardwood. Brown and shriveled in the field, but rehydrated when left in a moist chamber for a day. Hymenium yellow, becoming orange brown. The receptacle is scurfy brown. Clustered and erumpent through the bark. The largest slightly larger than 2mm in diameter. Some with short pseudo stipe.

Asci:
IKI-, croziers+, clavate, 35-54 x 4-7µm

Spores:
biseriate in the asci, hyaline, fusiform, sometimes slightly curved, usually with two oil drops,
5.0-7.6 (8.5) x 1.7-2.0 (2.3)µm
Me 6 x 1.9µm
N=48
Q 2.5-4.3 MeQ=3.1

Paraphyses:
septate, slightly tapering, about 2µm wide

Ectal excipulum brown, textura angularis.

KOH produces red pigments (ionomidotic reaction)

Probably the same as:
https://www.inaturalist.org/observations/101202167

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