Fraxinus excelsior, Poland, Bialowieza © Sébastien Carbonnelle: the cleistothecia are relatively large, while the mycelium is very thin.

Fraxinus excelsior, Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel

cleistothecium

Fraxinus excelsior, Amsterdamsche Bosch: cleistothecium

gall

mycelium mainly hypophyllous, weak, effuse (also internal). Conidia single, clavate, without fibrosin bodies. Foot cell of conidiophore mostly straight, sometimes sinuate and twisted. Cleistothecia hypophyllous, containing 10-25 asci, each with 2-4 spores. Appendages in an equatorial circle of 6-15 stiff, acicular appendages that are abruptly swollen at their base, 1-2 as long as the diameter of the cleistothecium.

host plants

Oleaceae (Apocynaceae, Fabaceae) essentially oligophagous

Asclepias curassavica, incarnata, syriaca; Chionanthus virginicus; Fontanesia phillyreoides; Fraxinus angustifolia & subsp. oxycarpa + syriaca, dipetala, excelsior, nigra, ornus, pallisiae, pennsylvanica, sogdiana; Ligustrum vulgare; Syringa villosa & subsp. wolfii, vulgaris; Wisteria sinensis.

Infections of non-Oleaceae are only occasional.

references

Blumer (1967a), Braun (1997a), Braun & Cook (2012a), Bresinsky (2016a), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Jage, Kruse, Kummer ao (2013a), Kabaktepe, Akata, Siahaan ao (20167), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Roques, Cleary, Matsiakh & Eschem (2017a), Ruszkiewicz-Michalska & Michalski (2005a), Scheuer & Bechter (2012a), Scholler, Schmidt, Meeboon ao (2017a), Sucharzewska, Dynowska, Kubiak ao (2012b).