Podosphaera filipendulae (Zhao) Liu & Braun, 2010
on Filipendula

Filipendula ulmaria, Vlaardingen, Holy-natuurpark © Ben van As

Filipendula ulmaria, France, Haute Savoie, Rhône Alpes, Bionnay, 900 m © Arnold Grosscurt

detail

Filipendula ulmaria, Germany, Harz, Wildemann © Hans Jonkman: galled inflorescence

Filipendula ulmaria, Belgium, prov. Antwerp, Geel, Neerhelst © Carina Van Steenwinkel: fungus on galled part of the stem

conidiophores

conidia with fibrosin bodies
gall
mycelium amphigenous, also on stems, white, persistent; infected stems often distorted. Appressoria indistinct. Conidia oval, formed in chains, with fibrosin bodies. Cleistothecia, often in groups, with a single ascus, containing 6-8 spores. Appendages numerous, ± equatorial, 1-5 x the diameter; they are ± stiff, curved, septate, simple, dark brown when mature.
host plants
Rosaceae, monophagous
Filipendula kamtschatica, ulmaria, vulgaris.
notes
morphologically, the fungus cannot be distinguished from Podosphaera spiraeae, and on this ground it has long been considered synonymous with that species. However, DNA research has demonstrated that two perfectly separated species are involved.
references
Braun & Cook (2012a), Bresinsky (2016a), Doppelbaur & Doppelbaur (1973a “Sphaerotheca macularis”), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Leysen (2017a), Scholler, Reinhard & Schubert (1996a [Sphaerotheca spinaeae on Filipendula ulmaria]).