Puccinia mirabilissima Peck, (mahonia rust)


17 Apr 2007 at OSGR: SU56 in Berks, England

Record Summaryuredia and telia: heavy infection on leaves of cultivated Oregon Grape
Found asTelia (III)
Date17 April 2007
Associated organismMahonia aquifolium
OS grid refOSGR: SU56
Lat/Lon51° 20’ N, 1° 10’ W
Vice CountyBerks, VC no: 22
CountryEngland
Voucher17 Apr 2007[A]
(Please quote this in any queries about this record)

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.

The following literature was used to identify this find:

standard photographs and close-ups
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