#erysiphales

Unassuming white scabs from afar, but beautiful pearls of conidia up-close!

Powdery mildew (Podosphaera amelanchieris on Amelanchier lamarckii) chasmothecia with dichotomous appendages.

Ampelomyces quisqualis -hyperparasite fungus producing conidiospores (small spores) on its host fungus (Erysiphe azalea; bigger hyaline spores) that lives on Rhododendron azalea.

Germinating conidiospores of the fungus Golovinomyces cynoglossi (Erysiphales) on lungwort (Pulmonaria montana).

My workmate brought me these diseased Passiflora caerulea -leaf samples. The fungus causing the powdery mildew symptoms was identified as Pseudoidium passiflorae fungus. That is the anamorph (asexual stage) of the Erysiphe sp. fungus, producing single conidia on the conidiophores that rises from the mycelium. The multilobed appressoria are also seen in the pictures.

Erysiphe symphoricarpi -powdery mildew fungus infecting western snowberry (Symphoricarpos occidentalis). Chasmothecia were densely clustered on the leaves. The appendages of the chasmothecia are clearly dichotomously branched, tips not recurved.

Golovinomyces biocellatus -powdery mildew fungus infecting and producing conidiospores on Salvia sp.. + Asci with two ascospores (inside ascus) are seen being released from the chasmothecium, that are sexual reproductive structures of this fungus.