Peronospora cyparissiae de Bary, 1863
upper side of the leaf with pale spots. Underside with a greyish white to brown down of erect conidiophores that apically several times are branching, each branch ending upon an elliptic conidium, 14-20 x 18-26 µm (on average 17.6 x 21.8).
Euphorbiaceae, narrowly monofaag
Euphorbia amygdaloides, cyparissias, esula, maculata.
P. esulae Gäumann, 1919, that is mentioned by Voglmayr (2003a) for Euphorbia esula, is considered conspecific with cyparissiae by Klenke & Scholler. However, Jage, Klenke, Kruse ao (2017a) consider esulae a valid species, on the base of different conidia measures. Whether E. esula is host plant to both taxa is not clear.
Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a: 337), Doppelbaur & Doppelbaur (1974a), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Ludwig (1974a), Müller & Kokeš (2008a), Săvulescu (1948a), Schmid-Heckel (1985a), Voglmayr (2003a).