Coleosporium asterum (Dietel) Sydow & Sydow, 1914

on Asteraceae

Symphyotrichum parviflorum, Hungary, Kimle, 13.vii.2019 © László Érsek: infected population

detail

infected leaf, upper side

infected leaf, underside

gall

in Europe only uredinia are known: bright yellow, pulverulent, mainly hypophyllous.

The uredinia and telia of Coleosporium species morphologically are indistinguishable. For pictures see for instance C. melampyri en C. tussilaginis.

uredinia, telia

Asteraceae, narrowly oligophagous

Callistephus chinensis; Soidago canadensis, gigantea, sempervirens, virgaurea.

In North America also Symphyotrichum ciliolatum

notes

originally a North American species, that also has colonised the European Solidago virgaurea, and, as the pictures above demonstrate, also Symphyotrichum parviflorum.

references

Bahcecioglu & Kabaktepe (2012a), Beenken & Senn-Irlet (2016a), Klenke & Scholler (2015a), Maier, Begerow, Weiß & Oberwinkler (2003a), McTaggart, Geering & Shivas (2014a), Spooner & Butterfill (1999a), Talhinhas, Carvalho, Figueira & Ramos (2019a).