Favoritos de chyroptera

Light brown growth on Quercus agrifolia leaf underside. Spores in 1st photo?

Chasmothecia(?) in photo 2 matches appearance seen in this paper?:
https://journals.ashs.org/downloadpdf/journals/hortsci/57/10/article-p1289.pdf

Photos 6, 7, 10, 11 appear to show the ornamented chasmothecia/perithecia hyphal appendages:

https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/erysiphaceae

https://onlinelibrary.wiley.com/doi/10.1111/efp.12742

https://www.sciencedirect.com/science/article/abs/pii/S095375620700130X

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Golovinomyces or Erysiphe?

https://www.flickr.com/photos/40948266@N04/44573612594/in/photolist-2b5wPn1-2b5wPru-2ci3fYb-2ci3g6q-2aCyxrq-29fes1j-NfvH4k-2aUNM3j-NfvJoK-293zSJE-2aUPq6Y-2aVBSFv-2ccLXg6-293zR8U-29AR4c1-2c8dd5A-29rckyQ-2c8dhmG-29rcoyN

Amended note (11/19):

Probably not downy mildew based on seemingly not being restricted to lower surface?

Other similar observations in the area on same host (Quercus agrifolia):

https://www.inaturalist.org/observations/191495698
https://www.inaturalist.org/observations/169798850
https://www.inaturalist.org/observations/168032122
https://www.inaturalist.org/observations/167625572

Research notes from:
https://pubmed.ncbi.nlm.nih.gov/30743683/

"White superficial conidia of the powdery mildew fungus occurred on adaxial and abaxial surfaces. However, the white powdery growth was more abundant on the adaxial surface. Leaf symptoms commonly appeared white from May to October. Along with the typical white powdery mildew, spot and/or necrotic symptoms with irregular violet-to-wine red surfaces were also frequently observed on overwintered leaves"

"Major genera including Cystotheca, Erysiphe, Microsphaera, and Phyllactinia have been reported to cause powdery mildews on Quercus plants. Until now, 22 Erysiphe species including E. abbreviata, E. alphitoides, E. calocladophora, E. gracilis, E. polygoni, and E. quercicola have been reported to cause powdery mildews on Quercus spp."

Galls along midribs of young Oregon Ash leaves. The gall part of each leaf feels hard and thickened to the touch, and folds upward to form a pocket. I opened a couple of them and found several small larvae inside the pockets (see photos).

This looks a lot like the galls described here:
https://www.gallformers.org/gall/3035

One of many leafmines present on Scotch Broom (Fabaceae: Cytisus scoparius) growing in meadow/field habitat. Photo 1 shows the upper surface of leaf; Photo 2 shows the underside of leaf; Photo 3 is the upper surface of leaf backlit with flashlight from cellphone.

With phoretic nest parasite beetles, which have their own observation here

For more information about this species, see articles here, here, and here.

This is the first year I have ever noticed these galls forming. I have seen them on a majority of Stachys observed in the region as of August 2023. These galls were not present in the last 3-4 years since I have been observing Stachys.
https://www.gallformers.org/gall/3020
https://www.inaturalist.org/observations/88781124#identification-6040c2b0-f087-4622-9032-6382a68a1560
@cosmopterix