Phylum: Ascomycota	Class: Leotiomycetes
Order: Helotiales	Family: Rutstroemiaceae
Species: Rutstroemia firma (Pers.) P. Karst.

Synonyms:

Ciboria ochroleuca Cwpan Derw Hymenoscyphus firma Hymenoscyphus firmus Lanzia firma Peziza firma Phialea firma Poculum firmum

Common Name:

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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: Quercus (14) Quercus petraea (9) Quercus robur (5) Alnus glutinosa (3) Betula (1) Corylus avellana (1) Fagus sylvatica (1)

Habitat (where recorded) & number of records: Woodland: broadleaved, semi-natural (11) Woodland (6) Built up area, domestic (3) Neutral grassland: semi-improved (3) Parkland and scattered trees (3) Woodland and scrub (3) Woodland: broadleaved, plantation (3) Woodland: mixed (3) Parkland and scattered trees: mixed (2) Woodland: broadleaved (2) Woodland: coniferous, plantation (2) Woodland: mixed, semi-natural (2) Acid sessile oak-hazel-ash woods (1) Grassland: acidic, unimproved, lowland (1) Scrub (1) Woodland: broadleaved, semi-natural, high forest (1) Woodland: broadleaved, semi-natural, under planted (1) Woodland: mixed, plantation (1) Woodland: mixed, plantation, high forest (1)

Substrate (where recorded) & number of records: Branch (11) Fallen Twig (6) Twig (5) Wood (5) Dead Wood (3) Dead Branch (2) Fallen Branch (2) Dead Attached Branch (1) Dead Twig (1) Leaf (1)

Months recorded in & number of records: March (4) June (1) August (1) September (5) October (29) November (10) December (1)