Although conidia not typical, perhaps a little immature, the macro symptoms match https://plantpestimages.wordpress.com/tag/cylindrosporium-castaneae/
Associations:
has host Castanea sativa Mill.
Substrate:
leaf spot
Other components
Active identification
Determined name:
Castanea sativa Mill.
Determiner:
Identification date:
Preferred name:
Castanea sativa Mill.
Division:
Tracheophyta
Class:
Magnoliopsida
Order:
Fagales
Family:
Fagaceae
Identification type:
Determination
Collection events
Primary collection event
Collection event type:
Field
Verbatim collector:
P.R. Johnston
Standardised collector:
Peter R. Johnston
Verbatim date:
26 Dec 2018
Start date:
2018-12-26
Country:
France
Specimen notes
Public Note:
Fungus found on leaves used to wrap commercially produced feta cheese, imported from France. e.g. https://www.sensibus.com/cheeses/chestnut-leaf-wrapped-goat-robiola
P.R. Johnston