Coleosporium petasitis (de Candolle) de Bary, 1865

on Pinus

gall

See description under Coleosporium tussilaginis sensu lato

spermogonia, aecia

Pinaceae, monophagpous

Pinus.


on Petasites

Coleosporium petasitis: uredinia on Petasites hybridus

Petasites hybridus, Vreeland: uredinia

Coleosporium petasitis: uredinium on Petasites hybridus

detail

Coleosporium petasitis: urediniospores

Petasites hybridus, Diemen: urediniospores

Coleosporium petasitis: telia on Petasites hybridus

leaf in mid-September, its underside coloured red by telia

Coleosporium tussilaginis: telia on Petasites hybridus

telia

gall

the teliospsores are arragned 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 hapoid 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), Mims & Richardson (2005a), Poelt & Zwetko (1997a), Riegler-Hager (2014a), Schmid-Heckel (1985a), Tomasi (2003a), Tóth (1994a).

27/05/2017

mod 15.vii.2017