Phragmidium candicantium (Vleugel) Dietel, 1927
on Rubus

from Gäumann (1959a): comparison of the urediniospore of Ph. bulbosum (at left, on Rubus caesius) with one of Ph. candicatium (at rhight, on R. grabowskii)
Rubus grabowskii, from Gåumann (1959a) teliospore
gall
no alternation of hostplant, only uredinia and telia. Uredinia hypophyllous, small, surrounded by paraphyses; spores 18-21 x 21-26 µm, at most 4 germination pores; wall more remotely spinulose than in the related Ph. bulbosum. Telia hypophyllous, black; spores as in bulbosum but with (5)6-7(8) cells and apically a small hyaline papilla.
hostplants
Rosaceae, narrowly monophagous
Rubus canescens, constrictus, grabowskii.
synonyms
Phragmidium rubi var. candicantium Vleugel, 1908.
references
Brandenburger (1985a: 244), González-Fragoso (1925a), Helfer (2005a), Jørstad (1953a), Klenke & Scholler (2015a), Poelt & Zwetko (1997a).
23/04/2017