Peronospora violacea Berk., (a downy mildew)


18 Sep 2007 at OSGR: SU57 in Berks, England

Record Summaryon florets of Field Scabious
Found as
Date18 September 2007
Associated organismKnautia arvensis
OS grid refOSGR: SU57
Lat/Lon51° 30’ N, 1° 10’ W
Vice CountyBerks, VC no: 22
CountryEngland
Voucher18 Sep 2007[E]
(Please quote this in any queries about this record)

Notes:

Oospores: embedded in corolla tissues, epispore thick, pale at first, becoming brown and irregularly plicate.

Sporangia: ellipsoid to ovoid, hyaline when young and weakly cyanophilic, becoming violaceous grey-brown and acyanophilic, 33-42/19-24µm.

Sporangiophores: erect, branched at apex, with swollen base and patch of cyanophilic material attached.

The following literature was used to identify this find:

standard photographs and close-ups
standard photographs and close-ups:
macro-photographs
macro-photographs:
photomicrographs
photomicrographs:

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