Centaurea jacea, Amstelveen, Schinkelbos: urediniospores

gall

No host plant alternation. Spermogonia orange. Aecia are not formed. Uredinia light brown, hypophyllous, on yellow or brown leaf spots; spores 19-29 x 21-21 µm, spinulose, with 2 supra-equatorial pores, each one surrounded by a smooth zone. Telia as the uredinia, blackish brown, otherwise like the uredinia. Teliospores 2-celled, short-elliptic, 20-28 x 28-42 µm; cell wall finely verrucuose.

host plants

Asteraceae, narrowly oligophagous

Centaurea alba, coronata, diffusa, exarata, fenzlii, jacea & subsp. angustifolia, macrocephala, nervosa, nigra, nigrescens & subsp. transalpina, phrygia & subsp. pseudophrygia + stenolepis, pugioniformis, stoebe, virgata & subsp. squarrosa; Cheirolophus canariensis; Cyanus segetum; Rhaponticum repens.

synonyms

often considered identical with, or a variety of, P. hieracii.

references

Brandenburger (1985a: 660), Buhr (1964b), Gäumann (1959a), Jage, Klenke, Kruse ao (2016a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Schmid-Heckel (1985a), Termorshuizen & Swertz (2011a).