Phyllactinia guttata (Wallroth) Léveillé, 1851

on Corylus

Phyllactinia guttata galling leaves of Corylus avellana

Corylus avellana, Diemen. As a result of the mildew infestation, at the underside of the leaves, the leaf margins strongly curve downwards.

Phyllactinia guttata on Corylus avellana

Corylus avellana, Zwolle © Arnold Grosscurt

Phyllactinia guttata on Corylus avellana

detail

Phyllactinia guttata causing greeen islans on Corylus avellana

Corylus avellana, Nieuwendam: in autumn the infected spots are recognisable as green islands in the yellowing leaves

Phyllactinia guttata: cleistothecium

cleistothecium, with the swollen bases of the setae that are characteristic for the genus
Phyllactinia.

Phyllactinia guttata: young and old cleistothecium

also young cleistothecia (at right) already show this character.

Phyllactinia guttata: asci

two asci

gall

mycelium both internal and external; external mycelium hypophyllous, thin, greyish or white, sometimes persistent. Appressoria nipple-shaped, hook-like, sometimes branched or somewhat lobate. Conidia formed one by one, clavate, without fibrosin bodies. Conidiophore long and thin. Cleistothecia hypophyllous, with 15-35 asci that contain 2 spores. Appendages 4-12, in an equatorial circle, 1-2.5 as long as the diameter of the cleistothecium. They are acicular, abruptly and strongly swollen at their base.

host plants

Betulaceae, monophagous

Corylus americana, avellana, colurna, cornuta subsp. californica, ferox, heterophylla, maxima

synonyms

Phyllactinia berberidis Palla, 1899.

notes

References to birch concern Ph. betulae; on beech: Ph. orbicularis; on hornbeam: Ph. carpini.

The reference to Sambucus nigra by Jage, Scholler & Klenke probably stems from cleistothecia that have been brought by the wind from another plant species.

predatoren

See Halyzia sedecimguttata.

synonyms

Phyllactinia corylea (Persoon) Karsten, 1900; Ph. suffulta (Rebentisch) Saccardo, 1880.

references

Abras, Fassotte, Chandelier & Cavelier (2008a), Adamska (2005a), Blumer (1946a, 1967a), Brandenburger (1985a: 63), Braun (1997a), Bresinsky (2016a), Dynowska, Fiedorowicz & Kubiak (1999a), Ellis & Ellis (1997), Jage, Klenke, Kruse ao (2016a), Jage, Klenke & Kummer (2010a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Mayor (1971a), Ruszkiewicz-Michalska (2006a), Scheuer & Bechter (2012a), Sucharzewska, Dynowska, Kubiak ao (2012b), Talgø, Sundheim, Gjærum ao (2010a), Tóth (1994a), Unamuno (1941a, 1942a).

mod 21.vii.2019