Viburnum lantana, Belgium, prov. Antwerp, Balen, de Vennen © Carina Van Steenwinkel

gall

Mycelium amphigenous, but best developed at the underside of the leaf. Conidia solitary, elliptic, without fibrosin bodies. Cleistothecia 65-90 µm, with 2-4 asci containing 4-7 spores. Appendages 3-8, equatorial, 1-1.5 x the diameter; they are stiff, extending, brown at the base, have 0-1 basal septa, the cell wall is smooth or rough; apcially they are ± 4-5 times bifurcated in quick succession.

According to Klenke & Scholler conidia are formed regularly, and the cleistothecia are amphigenous.

hostplants

Adoxaceae, monophagous

Viburnum burejaeticum, carlesii, ?glomeratum, lantana, tinus.

synonyms

Microsphaera hedwigii (Léveillé) Saccardo, 1882.

notes

Not on Viburnum opulus; see Erysiphe viburni for that host plant.

references

Ale-Agha, Boyle, Braun ao (2008a), Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Jage, Klenke & Kummer (2010a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kruse (2014a), Kruse & Jage (2014a), Sucharzewska, Dynowska, Kubiak ao (2012b), Świderska, Wołczańska, Kozłowska ao (2005a).