Coleosporium petasitis (de Candolle) de Bary, 1865
on Pinus
gall
See description under Coleosporium tussilaginis sensu lato
spermogonia, aecia
Pinaceae, monophagous
on Petasites
Petasites hybridus, Vreeland: uredinia
detail
Petasites hybridus, Diemen: urediniospores
leaf in mid-September, its underside coloured red by telia
telia
gall
the teliospores are arranged like basalt columns, on top covered by a layer of a waxy substance. Initially they are one-celled, but in the end meiosis takes place, resulting in a chain of four haploid cells. Each one germinates under formation of a sterigma (picture above), on top of which eventually a spore will be formed (Mims & Richardson).
The uredinia and telia of Coleosporium species morphologically are indistinguishable. For pictures see for instance C. melampyri and C. tussilaginis.
uredinia, telia
Asteraceae, monophagous
Petasites albus, frigidus, hybridus, japonicus, kablikianus, paradoxus, radiatus.
synonyms
Coleosporium tussilaginis f. sp. petasitis Boerema & Verhoeven, 1972
references
Blumer (1946a), Brandenburger (1985a: 24, 648), Gäumann (1959a), González-Fragoso (1925a), Helfer (2013), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kruse (2019a), Mims & Richardson (2005a), Poelt & Zwetko (1997a), Riegler-Hager (2014a), Schmid-Heckel (1985a), Tomasi (2003a), Tóth (1994a).