Phylum: Basidiomycota	Class: Agaricomycetes
Order: Boletales	Family: Paxillaceae
Species: Paxillus involutus (Batsch) Fr.

Synonyms:

Agaricus adscendibus Agaricus contiguus Agaricus involutus Omphalia involuta Paxillus involutus agg. Paxillus involutus var. excentricus Paxillus involutus var. subinvolutus

Common Name:

Brown Rollrim

An ectomycorrhizal species

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This distribution map was produced using DMap

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: Betula (74) Betula pendula (50) Fagus sylvatica (27) Betula pubescens (23) Corylus avellana (8) Picea abies (5) Quercus (4) Larix (4) Larix decidua (3) Fraxinus excelsior (3) Abies procera (3) Pinus sylvestris (2) Betula jacquemontii (2) Picea (2) Pinus radiata (1) Pinus (1) Quercus petraea (1) Castanea sativa (1) Carpinus betulus (1) Abies (1) Picea sitchensis (1) Alnus glutinosa (1)

Habitat (where recorded) & number of records: Woodland: broadleaved, semi-natural (34) Woodland and scrub (16) Woodland: mixed (16) Woodland (13) Woodland: broadleaved (9) Built-up areas (7) Parkland and scattered trees: mixed (7) Parkland and scattered trees (6) Woodland: coniferous, plantation (5) Neutral grassland: semi-improved (4) Woodland: broadleaved, plantation (4) Woodland: mixed, plantation (4) Woodland: mixed, semi-natural (4) Acid grassland (3) Bog: raised (3) Built up area, domestic (3) Mire: blanket bog (3) Bog (2) Woodland: plantation (2) Acid grassland: semi-improved (1) Acid grassland: unimproved (1) Boundaries: hedge with trees (1) Boundaries: hedge with trees, species-rich (1) Calcareous grassland: semi-improved (1) Marginal/inundation: marginal (1) Neutral grassland: unimproved (1) Parkland and scattered trees: broadleaved (1) Scrub (1) Wet dwarf shrub heath (1) Woodland: coniferous (1)

Substrate (where recorded) & number of records: Soil (92) Soil Leaves (32) Soil Grassy (30) Soil Mossy (29) Soil Needle (8) Soil Peat (3) Dead Wood (1) Grass (1) Leaf Litter (1) Soil bare (1) Tree (1)

Months recorded in & number of records: January (10) March (4) May (1) June (2) July (10) August (62) September (107) October (91) November (17)