Podosphaera macrospora (Braun) Braun & Kummer, 2008
on Saxifragaceae
Tellina grandiflora, Belgium, prov. Antwerp © Carina Van Steenwinkel
another leaf, underside
tiny cleistothecia
cleistothecia
cleistothecia and asci
conidiophore
conidium
gall
mycelium amphigenous, forming persistent greyish white spots. Appressoria rather indistinct. Conidia formed in chains, with fibrosin bodies. Cleistothecia with a single ascus, containing (6-) 8 spores. Appendages in variable number, mostly sub-equatorial, 0.3 – 3 x the diameter; they are myceloid, mostly unbranched, generally entirely brown.
host plants
Saxifragaceae, oligophagous
Heuchera sanguinea, villosa; Saxifraga nelsoniana; Tellima grandiflora; Tiarella cordifolia, wherryi; Tolmiea menziesii.
notes
North American species, in Europe only on garden ornamentals.
part of the mycelium had a greyish brown colour, because it was parasitised by Ampelomyces quisqualis.
hyperparasites
references
Ale-Agha, Boyle, Braun ao (2008a), Beenken & Senn-Irlet (2016a), Bolay, Clerc, Braun, ao (2021a), Braun & Cook (2012a), Bresinsky (2016a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a), Kruse (2014a), Kummer (2009a), Leysen (2017a).