BioImages: The Virtual Field-Guide (UK)

(Coelomycetes) (stem- and leaf-fungi)

Date 15 October 2008
OS grid ref SU56
Lat/Lon 51° 20' N, 1° 10' W
Location Vice County: Berks, VC22, England
Voucher 15/10/2008[A]
(Please quote this in any queries about this record)
Stage or state Anamorph
Record Summary spots on Lilac leaves
Associated organism: on live, spotted leaf of Syringa vulgaris
Identification Notes: Leaf spots: above: pale brown with darker brown borders, concentrically zoned; below: pale brown, sometimes inflated but this might be secondary. Eventually splitting.

Pycnidia: only on one or two leaf spots, quite dense where they occur.

Conidia: hyaline, slightly curved, narrow, becoming centrally 1-septate, 10-21/1-1.3µm.

This ought to be Phyllosticta syringae but the conidia are too narrow and far too long. It's probably a secondary infection. The pycnidia were densely crowded in a small area. Parts of some of the leaf spots had pits where pycnidia or perithecia had dropped out. These pits were more widely spaced than the present pycnidia. Need to revisit earlier in the season next summer.

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