Phylum: Ascomycota Class: Leotiomycetes
Order: Helotiales Family: Helotiaceae
Species: Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya
Synonyms: Ash Dieback
Chalara fraxinea
Hymenoscyphus pseudoalbidus
Lladdwr yr Ynn
Common Name: Ash Die back disease


Ubiquitous throughout Northern Ireland.
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This distribution map was produced using DMap
Hymenoscyphus fraxineusPhotographer: © David Mitchel
On Ash, Fraxinus excelsior
Photographer: © David Mitchel

Photographer: © Roy Anderson
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View this species in its UK context on the NBN Atlas
Associated Species (where recorded) & number of records:
Fraxinus excelsior (16)
Corylus avellana (1)
Habitat (where recorded) & number of records:
Woodland: mixed, semi-natural (9)
Woodland: broadleaved, plantation (2)
Woodland: broadleaved, semi-natural (2)
Woodland: mixed, plantation (2)
Woodland and scrub (1)
Substrate (where recorded) & number of records:
Rhachis (11)
Leaf (3)
Nut (1)
Twig (1)
Months recorded in & number of records:
June (2)
July (8)
August (8)
September (1)