Plant Parasites of Europe

leafminers, galls and fungi

Erysiphe guarinonii

Erysiphe guarinonii (Briosi & Cavara) Braun & Takamatsu, 2000

on Cytisus, etc.


mycelium amphigenous, effuse, persistent. Appressoria lobed, single. Conidia solitary, elliptic, without fibrosin bodies. Foot-cell of conidiophore straight or curved-sinuous. Cleistothecia with 5-10 asci, containing 4-6 spores. Appendages 4-20, inserted on the equator or somewhat above, 6-12 x the diameter; they are hyaline, aseptate, flexuous; unbranched but the very tip is 3 – 4 x dichotomously bifurcated in quick succession.

host plants

Fabaceae, oligophagous

Baptisia australis; Cytisus hirsutus, nigricans, purpureus; Laburnum alpinum, anagyroides.


Microsphaera guarinonii Briosi & Cavara, 1892; Erysiphe baptisiae Braun & Kruse, 2010.


Beenken & Senn-Irlet (2016a), Bolay, Clerc, Braun, ao (2021a), Braun (1995a), Braun & Cook (2012a), Braun, Kruse, Wolcan & Murace (2010a), Bresinsky (2016a), Cook, Henrici & Braun (2014a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a), Kruse (2014a), Mayor (1967a “Microsphaera rayssiae”), Leysen (2017a).

Last modified 6.xii.2021