Phyllachora graminis

Phyllachora graminis is a fungal plant pathogen that affects many grass species, including some of our most common grasses.  The upperside or underside of the leaves develop numerous, elongated, black blisters. Embedded in the tissue are cavities filled with asci or linear conidia. 

Please provide photographs and state the host grass species. Specimen should be microscopically examined.

Galls may be seen wherever the host grass species occur.

Late summer and autumn.

Widespread and fairly frequent in Britain.

Probably fairly frequent, but under recorded in Leicestershire and Rutland.