Acer platanoides, Belgium, Liège © Jean-Yves Baugnée; det. Arthur Vanderweyen

detail; the still young cleistothecia are recognisable as small yellow dots.

gall

Contrary to the much more common S. bicornis, the mycelium is mainly upper-surface, shining white and sharply delimited. Conidia in chains, with fibrosin bodies, variable in size. Cleistothecia generally epiphyllous, with 40-100 rather short stiff appendages, a small number of them bifurcate, each tip ending in a small hook.

hostplants

Sapindaceae, monophagous

Acer monspessulanum, platanoides, saccharum, tataricum & subsp. ginnala.

Not on A. campestre, negundo, or pseudoplatanus.

references

Ale-Agha, Boyle, Braun ao (2008a), Braun & Cook (2012a), Bresinsky (2016a), Czerniawska (2001a), Dynowska, Fiedorowicz & Kubiak (1999a), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Korytnianska & Popova (2012a), Piątek (2004a), Ruszkiewicz-Michalska (2006a), Sucharzewska, Dynowska, Kubiak ao (2012b), Świderska, Wołczańska, Kozłowska ao (2005a), Talgø, Sundheim, Gjærum ao (2010a).