BioImages: The Virtual Field-Guide (UK)

Cumminsiella mirabilissima (Peck) Nannf. (Mahonia Rust)

Date 17 April 2007
OS grid ref SU56
Lat/Lon 51° 20' N, 1° 10' W
Location Vice County: Berks, VC22, England
Voucher 17/04/2007[A]
(Please quote this in any queries about this record)
Stage or state Telia (III)
Record Summary uredia and telia: heavy infection on leaves of cultivated Oregon Grape
Associated organism: hypophyllous on live leaflet of Mahonia aquifolium
Identification Notes: Infection causes bright orange patches, deepening to red, on the upperside of the leaflet, with blackish necrotic spots above the hypophyllous sori. The leaf underside turns dirty yellow. Finally the leaflet falls.

Punctiform sori scattered over leaf underside and not confined to the discoloured areas.

Urdeospores: abundant, 28-40/19-22µm, clavate to spheropedunculate, with punctate walls.
Telia: with two round cells and long persistent pedicels; mixed with uredospores.
Peridial cells: hyaline, clavate, with thick granular walls.

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