Phyllactinia orbicularis (Ehrenberg) Braun, 2012

on Fagus, Quercus

Phyllactinia orbicularis on Fagus sylvatica

Fagus sylvatica, Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel: upperside of an infected lead

Phyllactinia orbicularis on Fagus sylvatica

same leaf, underside

Phyllactinia orbicularis on Fagus sylvatica

heavy infection

Phyllactinia orbicularis on Fagus sylvatica

young and old cleistothecia

Phyllactinia orbicularis cleistothecium

cleistothecium

Phyllactinia orbicularis on Fagus sylvatica

Fagus sylvatica, Belgium, prov. Antwerp, Meerhout, Zeeploop © Carina Van Steenwinkel: fallen leaf

Phyllactinia orbicularis on Fagus sylvatica

also on the fallen leaf new cleistothecia are formed

gall

mycelium internal and external; the latter hypophyllous, white, persistent, conspicuous in fallen autumn leaves. Appressoria nipple- to rod-shaped, mostly single. Conidia single, clavate, without fibrosin bodies. Conidiophores erect, filiform. Cleistothecia hypophyllous with an equatorial circle of 4-18 stiff, acicular appendages that are abruptly swollen at their base, 1-2 as long as the diameter of the cleistothecium; their tips are blunt or even somewhat thickened. Asci 15-35, 2-spored.

hostplants

Fagaceae, oligophagous

Fagus orientalis, sylvatica, x taurica; Quercus faginea, ilex, macranthera, petraea, robur.

references

Braun & Cook (2012a), Bresinsky (2016a), Czerniawska (2001a), Jage, Klenke, Kruse ao (2016a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a), Tóth (1994a).

19/04/2017

pub 19.iv.2017 · mod 13.viii.2017