Peronospora lamii Braun, 1857
on Lamium

Lamium purpureum, Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel

the yellow spots turn brown later

fresh fungal down

conidiophores

conidia
gall
leaves with angular, brownish spots. Their underside with a greyish-violet down, consisting of erect conidiophores that apically several times are dichotomously branching, each branch ending in an globular conidium.
host plants
Lamiaceae, monophagous
Lamium album, amplexicaule, garganicum, maculatum, purpureum.
The reference to Salvia officinalis by Liberato ao probably refers to another species. This applies also to the reference by Holcomb (2000a) of lamii on Salvia splendens and S. coccinea. And also the association of lamii with Salvia officinalis and Rosmarinus officinalis (Humphreys-Jones ea) derives from a overly wide concept of that species.
references
Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a), Choi, Denchev & Shin (2008a), Choi, Shin & Thines (2009a), Cunnington (2008a), Doppelbaur & Doppelbaur (1974a), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Holcomb (2000a), Humphreys-Jones, Barnes & Lane (2008a), Jage, Klenke, Kruse ao (2017a), Liberato, Forsberg, Grice & Shivas (2006a), Göker, Voglmayr, Riethmüller ao (2003a), Gustavsson (1991a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Melzer, Pittoni, Poelt & Scheuer (1984a), Müller (2015a), Müller & Kokeš (2008a), Negrean, Constantinescu & Denchev (2004a), Riethmüller, Voglmayr, Göker ao (2002a), Ruszkiewicz-Michalska (2006a),Ruszkiewicz-Michalska & Michalski (2005a), Săvulescu (1948a), Thines, Telle, Ploch & Runge (2009b), Voglmayr (2003a).