Phylum: Ascomycota	Class: Leotiomycetes
Order: Helotiales	Family: Helotiaceae
Species: Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya

Synonyms:

Chalara fraxinea Hymenoscyphus pseudoalbidus

Common Name:

Ash Die back disease

Ubiquitous throughout Northern Ireland.

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This distribution map was produced using DMap

On Ash, Fraxinus excelsior

Photographer: © David Mitchel

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View this species in its UK context on the NBN Atlas

Associated Species (where recorded) & number of records: Fraxinus excelsior (6)

Habitat (where recorded) & number of records: Woodland: mixed, semi-natural (4) Woodland: broadleaved, semi-natural (1)

Substrate (where recorded) & number of records: Rhachis (5)

Months recorded in & number of records: July (4) August (2)