Golovinomyces ambrosiae (Schweinitz) Braun & Cook, 2009

Fungi, Ascomycota, Leotiomycetes, Erysiphales, Erysiphaceae

on Asteraceae, Heliantheae

Golovinomyces ambrosiae on Helianthus laetiflorus

Helianthus laetiflorus, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel

Golovinomyces ambrosiae on Helianthus laetiflorus

infected leaves, upperside

Golovinomyces ambrosiae on Helianthus laetiflorus

infected lef, underside, with cleistothecia

Golovinomyces ambrosiae on Helianthus laetiflorus

cleisothecia also on the stem!

Golovinomyces ambrosiae: clestothecium

cleistothecium with appendages

Golovinomyces ambrosiae: asci

two asci with spores

Golovinomyces ambrosiae:  conidiophore foot cell

the unusually long foot cell of the conidiophore

Golovinomyces ambrosiae: conidiun

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.

hostplants

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), Klenke & Scholler (2015a), Kruse (2014a), Kruse & Jage (2014a), Negrean & Anastasiu (2006a), Piątek (2004a), Ruszkiewicz-Michalska (2006a), Świderska, Wołczańska, Kozłowska ao (2005a).

19/04/2017

pub 25.v.2017 · mod 17.vii.2017