oak leaf blister

Taphrina caerulescens

Member of leaf curl fungi (genus Taphrina)
family Taphrinaceae
ascomycete fungi (phylum Ascomycota)
gall fungi
fungi including lichens (kingdom Fungi)
oak galls
galls

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• formers blisters on leaf surfaces of red oaks (section Lobatae) [source]
• Gallformers seems to list all oaks, but that’s likely pessimistic
• each strain infects a specific oak species, but the strains have not yet been taxonomically separated

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Chris’s observations: none

Taxon info: iNaturalist – Gallformers

Bay Area species: iNaturalist