BioImages: The Virtual Field-Guide (UK)
Peronospora violacea Berk., 1860 (a downy mildew)
| Date: | 18 September 2007 |
| Location: | Berks, England |
| Voucher: | 18/09/2007[E] (Please quote this in any queries about this record) |
| Record Summary: | on florets of Field Scabious |
| Associated organism: | on live corolla of Knautia arvensis |
| Identification 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. |
Images etc
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Infected capitulum - pale background - enlarged | 500 by 333 pixels | ||
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Infected capitulum - pale background | 454 by 500 pixels | ||
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Infected capitulum - pale background | 500 by 438 pixels | ||
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Infected capitulum - pale background | 500 by 415 pixels | ||
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Infected floret - magnified | 500 by 405 pixels | ||
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Infected floret - magnified | 500 by 333 pixels | ||
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Infected florets - grey background - enlarged | 500 by 274 pixels | ||
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Oospores - magnified | 500 by 333 pixels | ||
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Oospores - magnified | 500 by 299 pixels | ||
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Oospores - magnified | 500 by 333 pixels | ||
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Sporangia - magnified | 500 by 285 pixels | ||
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Sporangia - highly magnified | 500 by 486 pixels | ||
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Sporangiophore - magnified | 236 by 500 pixels | ||
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Sporangiophore - magnified | 500 by 210 pixels | ||
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Sporangiophores and sporangia - magnified | 500 by 391 pixels |
