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