Plant Parasites of Europe

leafminers, galls and fungi

Tracya hydrocharidis

Tracya hydrocharidis Lagerheim, 1902

on Hydrocharis

Tracya hydrocharidis on Hydrocharis morsus-ranae

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.

Tracya hydrocharidis on Hydrocharis morsus-ranae

the finale stage: the leaf tissue is decomposing, releasing the spore balls

Tracya hydrocharidis on Hydrocharis morsus-ranae

spore balls

Tracya hydrocharidis on Hydrocharis morsus-ranae

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

Tracya hydrocharidis on Hydrocharis morsus-ranae

detail

Tracya hydrocharidis on Hydrocharis morsus-ranae

crushed spore balls, showing the outer layer of spores.

Tracya hydrocharidis on Hydrocharis morsus-ranae

surface of the spore layer

Tracya hydrocharidis on Hydrocharis morsus-ranae

side view of the spore layer

gall

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.

hostplants

Hydrocharitaceae, monophagous

Hydrocharis morsus-ranae.

references

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).

Last modified 17.iii.2022