Puccinia hieracii


The rust fungus Puccinia hieracii causes galls in several Asteraceae genus - e.g. Knapweeds (Centaurea),  Hawkweeds (Hieracium), Hawkbits (Leontodon/Scorzoneroides), Ox-tongues (Helminthotheca/Picris), Mouse-ear Hawkweed (Pilosella), Saw-wort (Serratula) and Dandelion (Taraxacum).   

Typically, the gall is a thickened deformed leaf with reddish-yellow spots bearing aecia, followed by uredinia and telia.

Probably a species complex.  The gall-causing rust on Dandelion (Taraxacum) is listed as Puccinia taraxaci in Redfern and Shirley (2023) but with the rider that it may be a variety of Puccinia hieracii sensu lato.

Similar Species

Puccinia calcitrapae on Knapweed.  Puccinia variabilis has small orange aecia but is not thought to be a gall-causer. 

Identification difficulty
UK Status

Widespread in Britain.

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Species group:
Records on NatureSpot:
First record:
27/05/2016 (Grimes, Martin)
Last record:
10/10/2023 (lemmon, roy)

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% of records within its species group

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