Golovinomyces ambrosiae (Schweinitz) Braun & Cook, 2009
on Asteraceae, Heliantheae
Helianthus laetiflorus, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel
infected leaves, upperside
infected lef, underside, with cleistothecia
cleisothecia also on the stem!
cleistothecium with appendages
two asci with spores
the unusually long foot cell of the conidiophore
conidium
gall
mycelium amphigenous, thin, white, almost persistent. Appressoria nipple-shaped, single or paired. Conidia formed in chains, without fibrosin bodies. Foot-cell of conidiophore generally straight, unusually long (35-80 µm), followed by 1-3 shorter cells. Cleistothecia not rare, amphigenous, with 5-15 asci, containing 2(-3) spores. Appendages numerous, sub-equatorial, 0.5-2 x the diameter; they are mycelioid, mostly simple, septate, ultimately entirely brown.
host plants
Asteraceae, narrowly oligophagous:
Ambrosia artemisiifolia, confertiflora, psilostachya, trifida; Helianthus annuus, atrorubens, debilis, decapetalus, doronicoides, laetiflorus, maximilianii, pauciforus, petiolaris, salicifolius, scaberrimus, strumosus, tuberosus; Heliopsis helianthoides; Iva frutescens, xanthifolia; Pappobolus microphyllus; Rudbeckia fulgida, hirta, laciniata, laevigata, nitida; Zinnia angustifolia, elegans, haageana.
synonyms
Erysiphe cichoracearum var. latispora Braun, 1983; Golovinomyces cichoracearum var. latispora (Braun) Braun, 1999.
references
Beenken & Senn-Irlet (2016a), Braun & Cook (2012a), Bresinsky (2016a), Jage, Kruse, Kummer ao (2013a), Jage, Klenke & Kummer (2010a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Kruse & Jage (2014a), Negrean & Anastasiu (2006a), Piątek (2004a), Ruszkiewicz-Michalska (2006a), Świderska, Wołczańska, Kozłowska ao (2005a).