Plant Parasites of Europe

leafminers, galls and fungi

Synchytrium anemones

Synchytrium anemones (de Candolle) Woronin, 1868

on Anemone, Pulsatilla

Synchytrium anemones on Anemone nemorosa

Anemone nemorosa, Belgium, prov. Flemish Brabant, Londerzeel, Drietorens, 19.iv.2021 © Eric Daelemans

Synchytrium anemones on Anemone nemorosa

underside of an infected leaf

Synchytrium anemones on Anemone nemorosa

the leaves may become severely disfigured

Synchytrium anemones on Anemone nemorosa

nevertheless the plants become in flower

Synchytrium anemones on Anemone nemorosa

even though the flowers themselves are infected

Synchytrium anemones on Anemone nemorosa

the sori are hard and smooth, not powdery

Synchytrium anemones on Anemone nemorosa

Anemone nemorosa, Belgium, prov. Flemish Brabant, Holsbeek, Dunbergbroek, 23.iv.2021 © Carina Van Steenwinkel

Synchytrium anemones on Anemone nemorosa

the galling of the floral parts demonstrates the high speed of the development of the galling

Synchytrium anemones on Anemone nemorosa

each tiny gall involves a central cell surrounded by a circle of accessory cells

Synchytrium anemones on Anemone nemorosa

detail, lighted from behind

Synchytrium anemones on Anemone nemorosa

optical section

Synchytrium anemones on Anemone nemorosa

picture of the oldest galled part of the plant

Synchytrium anemones on Anemone nemorosa

sometimes the central cell bears a prolongation

Synchytrium anemones on Anemone nemorosa

detail

Synchytrium anemones on Anemone nemorosa

possibly this applies to cells programmed to differentiate into a trichome

section through two central cells, in which a resting spore differentiates

Synchytrium anemones on Anemone nemorosa

detail

Synchytrium anemones on Anemone nemorosa

in the cell at right the resting spore has developed a resistant wall

gall

hard, red to black-violet warts, up to 0.5 mm large, mainly at the underside of the leaves.

host plants

Ranunculaceae, monophagous

Anemone coronaria, nemorosa, ranunculoides, “seemenii”, sylvestris; Pulsatilla alpina.

references

Buhr (1964b), Dauphin & Aniotsbehere (1997a), Dietrich (2013a), Karling (1964a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2019a), Redfern & Shirley (2011a), Tomasi (2014a).

Last modified 28.iv.2021