Tracya hydrocharidis Lagerheim, 1902
Hydrocharis morsus-ranae, Belgium, prov. Limbourg, Gelinden 11.viii.2021 © Carina Van Steenwinkel: beginning infestation, recognisable as pale areas at the underside of the leaf.
the finale stage: the leaf tissue is decomposing, releasing the spore balls
Hydrocharis morsus-ranae, Belgium, prov. Antwerp, Laakdal, de Roost, 5.ix.2021 © Carina Van Steenwinkel: groups of spore balls in an as yet intact leaf
crushed spore balls, showing the outer layer of spores.
surface of the spore layer
side view of the spore layer
ill-delimited, up to some cm large, pale to brown leaf spots; embedded in the tissue up to 0.3 mm large spore balls. A spore ball consists of a globular, three-dimensional network of irregular filaments, with at its outside a closed, single layer of prismatic spores.
Brandenburger (1985a), Buhr (1964b), Gönczö & Révay (1981a), Klenke & Scholler (2015a), Scholz & Scholz (2013a), Spooner & Leon (2006a), Van Steenwinkel, Fraiture & Vanderweyen (2022a), Tomasi (2014a), Vánky (1981a, 1994a), Vánky & Abbasi (2013a).