BioImages: The Virtual Field-Guide (UK)

Unidentified Fungi s.s. (Unidentified True Fungi)

Date 22 April 2007
OS grid ref SU83
Lat/Lon 51° 10' N, 0° 40' W
Location Vice County: Surrey, VC17, England
Voucher 22/04/2007[H]
(Please quote this in any queries about this record)
Stage or state Anamorph
Record Summary grey leaf-spots on over-wintered leaves
Associated organism: on live, overwintered leaf of Rhododendron ponticum
Identification Notes: Large leaf-spots, 30-60mm diam., with wavy margin, on over-wintered leaves, usually starting from Vine Weevil damage along the margin or tip, (otherwise perhaps just the extreme centre drops out).

Upper surface: greyish-brown, weakly zonate to silver-grey centre, magin double with wavy black inner margin, separated by a pale band from a deep purple outer margin.

Under surface: brown, with central zone silver grey, otherwise hardly zonate, border double: narrow (<1mm) dark brown within, 1-1.5mm broad pale or greenish zone, then broader (1-3mm) pale purple outer margin.

Pycnidia not seen (appearance confused by Doratomyces stalk bases and hypophyllous punctiform colonies of sooty mildew/fly-speck fungus)

Pale punctiform superficial epiphyllous deposits (like extruded spore masses) in the brown zone. These contain cystidia-like cells, often with swollen 1-septate bases, but no spores seen.

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