Physoderma menyanthis (de Bary) de Bary, 1874

on Menyanthes

Menyanthes trifoliata, Belgium, prov. Limbourg, Ham, Immertse bossen, 29.v.2022 © Carina Van Steenwinkel

detail

squash of a sorus

up to vier sporangia per cell observed

isolated sporangia

te sporangia are thin-walled

measurements in the present material 20-27 x 28-35 µm (n=13)

gall

up to 1.5 mm large, first white or reddish, eventually brown pustules on the lamina.

host plants

Menyanthidaceae, monophagous

Menyanthes trifoliata.

synonyms

Cladochytrium menyanthis (de Bary) de Bary, 1897.

notes

Per host plant ce, up to four sporangia were observed. That is in agreement with an illustration by Coupin, but strongly differs from the maximum of 16 that is mentioned by Brandenburger. Klenke & Scholler state the mainly the petioles are infected; that too could not be confirmed in the Belgian material: the petioles were completely clean.

references

Brandenburger (1985a: 495), Buhr (1964b), Coupin (1911a), Doppelbaur & Doppelbaur (1973a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Redfern & Shirley (2011a), Scholler & Schubert (1993a), Tomasi (2014a).