Favoritos de sbrobeson

On Asarum canadense leaf

Shingle oak

Host: Urtica cannabina.

Found on the leaves of an oak tree (Quercus)

I kept a leaf from this, so maybe one day when I get access to a microscope I can actually provide pictures of microscopy. One can hope lol

mildew on Crepis atribarba

On Delphinium consolida

ex Viola

On cranesbill

On Indian Blanket (Gaillardia pulchella)

Zizania aquatica

Ex Plantago major; Introduction course for the identification of phytoparasitic fungi with @julia_kruse

cf. on Rhododendron menziesii, I will attempt to barcode these

Plantago maritima. Will scope.

On cultivated Stokesia laevis

DT 230334557

on Celtis occidentalis

on coffeeberry/Frangula californica

Gall on Acmispon americanus

Powdery mildew on Fagus grandifolia, which is infected with Beech Leaf Disease, as is every other beech tree in Alley Pond Park

on Juglans nigra

Powdery mildew on Mexican tea

ex Utricularia sp.

On Chinese photinia (Photinia davidiana). Based on other sequenced samples in iNaturalist observations

Rust on wild sarsaparilla leaf

Yikes!!!

A powdery mildew infection on a young tangerine shoot.

Powdery mildew on Prunus americana

on magnolia grandiflora

Corbin Canyon
On walnut

On Senecio bigelovii

On Cotinus

Maybe Podosphaera aphanis or something related?

On Medicago lupulina ,https://inaturalist.org/observations/220879191

I think it was on a Coast Live Oak leaf in the leaf litter.

Update, September 8th, 2024: I visited the site again to look at the leaves of this tree. I've added two images of how the infection has developed in the intervening months.

On heterotheca grandiflora

On Buddleja davidii (Butterfly bush)

On multiple leaves of Baccharis sarothroides.

On Figwort

On American wisteria

Gypsophila paniculata

ex Acer negundo

On Poterium sanguisorba (syn : Sanguisorba minor)

Por favor me ayudan con la ID de esta planta.