BioImages (UK)
BIOTA
(living things)
Eukaryota
(eukaryotes)
MYCETEAE
(fungi, moulds and lichens)
ASCOMYCOTA
(spore-shooters)
ASCOMYCETES
(spore shooters)
DOTHIDEOMYCETIDAE
(a subclass of ascomycetes)
MYCOSPHAERELLACEAE
(a family of ascomycetes and lichens)
Mycosphaerella
(a genus of ascomycetes)
Mycosphaerella rhododendri
(an ascomycete)
Record
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BioImages: The Virtual Field-Guide (UK)

Mycosphaerella rhododendri Lindau, 1903 (an ascomycete)

Date: 22 April 2007
Location: Surrey, England
Voucher: 22/04/2007[G]
(Please quote this in any queries about this record)
State: Perfect stage
Record Summary: large shot holes on over-wintered leaves with associated tiny perithecia
Associated organism: on live, over-wintered leaf of Rhododendron ponticum
Identification Notes: Large leaf spots, 50mm wide by 70mm long with centre eventually lost (possibly due to secondary infection) to form a large shot-hole with skeletonised centre.

Upper surface silver-grey and weakly zonate, with 1-2mm broad, smooth, dark purple margin, but cuticle soon splitting and peeling from the centre to reveal brown layer beneath. Black linear stromata arranged along midrib and primary veins and round or ellipsoid ones in a circle near edge of spot.

Under surface similar but browner.

Minute black perithecia in scattered groups, mainly below, especially near margin. Spores: cylindric (broader at apex), rounded at base, pointed at apex, 1-septate, 10/2.5µm.

Images etc

naked eye photograph Infected leaves - top views - pale background 412 by 500 pixels
magnified photograph Infected leaves - top views - pale background 486 by 500 pixels
naked eye photograph Infected leaves - undersides - pale background 412 by 500 pixels
magnified photograph Infected leaves - undersides - pale background 487 by 500 pixels
magnified photograph Leaf spot - top view - detail 453 by 500 pixels
magnified photograph Leaf spot - top view - pale background 385 by 500 pixels
magnified photograph Leaf spot - top view - pale background 339 by 500 pixels
magnified photograph Leaf spot - top view - pale background 408 by 500 pixels
magnified photograph Leaf spot - underside - detail 500 by 431 pixels
magnified photograph Leaf spot - underside - pale background 388 by 500 pixels
magnified photograph Leaf spot - underside - pale background 354 by 500 pixels
magnified photograph Leaf spot - underside - pale background 417 by 500 pixels
naked eye photograph Shot holes on leaves - in situ 500 by 333 pixels
naked eye photograph Shot holes on leaves - in situ 500 by 333 pixels
naked eye photograph Shot holes on leaves - in situ 500 by 333 pixels
microscope photograph Perithecium - squash prep (showing asci containing spores)- magnified 500 by 490 pixels
microscope photograph Perithecium - squash prep (showing mainly discharged spores) - magnified 500 by 289 pixels
microscope photograph Perithecium - squash prep (showing young asci?) - magnified 500 by 467 pixels
microscope photograph Perithecium - squash prep (showing young asci?) - magnified Good 500 by 406 pixels

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