Mahonia Rust - Cumminsiella mirabilissima


The rust fungus Cumminsiella mirabilissima affects the leaves of Berberis repens, Mahonia aquifolium and Mahonia japonica usually producing numerous small red spots on the upper leaf surface with brown uredinia beneath. Aecia are uncommon.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


Where the host plants occur.

When to see it

When the host plants are in leaf, most often towards autumn.

Life History


UK Status

Widespread in much of Britain.

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map


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

UK Map