Phragmidium violaceum (Schultz) Winter, 1880

on Rubus

Phragmidium violaceum

Rubus fruticosus, Vierhouten, Tureberg; © Arnold Grosscurt

Phragmidium violaceum

underside of the leaf, with uredinia

Phragmidium violaceum; uredinia on Rubus fruticosus

Rubus fruticosus, Vragenderveen: upperside and underside of a leaf with uredinia

Phragmidium violaceum: uredinium on Rubus fruticosus

uredinium

Phragmidium violaceum: telium on Rubus fruticosus

telium (to the left also an uredinium)

Phragmidium violaceum: urediniospore

urediniospore; diameter 22 µm

Phragmidium violaceum: teliospores

teliospores; length 82 µm

gall

no alternation of host plant. Aecia, uredinia, and telia hypophyllous, causing an intense violet spot at the reverse side. Aecia also on violet-lined swellings of the stems. Aecia without a peridium but surounded by a circle of hyaline, sausage-shaped curved paraphyses; spores produced in chains, spinulose. Uredinia equally encircled by paraphyses, spores single, pedicellate. Telia black; spores long pedicellate, elliptic, dark brown, transversely divided into 3-5 verrucose cells, terminated by a short but well-defined apiculus; each cell with 2-4 germination pores.

hostplants

Rosaceae, monophagous

Rubus bifrons, caesius, canescens, fruticosus, grabowskii, hirtus, laciniatus, lanuginosus, plicatus, sanctus, silvaticus, ulmifolius, ursinus var. loganobaccus.

references

Bahcecioglu & Kabaktepe (2012a), Brandenburger (1972a, 1985a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Dervis, Tok & Gunduz (2010a), Ellis & Ellis (1997a), Gäumann (1959a), Gjaerum (1982a, 1987a), Gjaerum & Dennis (1976a), González-Fragoso (1925a), Helfer (2005a), Henderson (2000a), Jage, Klenke, Kruse ao (2016a), Jage, Kruse, Kummer ao (2013a), Jørstad (1953a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a), Kruse & Jage (2014a), Llorens i Villagrasa (1984a), Maier, Begerow, Weiß & Oberwinkler (2003a), Pellicier (2001a), Petrova & Denchev (2004a), Poelt & Zwetko (1997a), Preece & Hick (1994a), Redfern & Shirley (2011a), Riegler-Hager (2000a), Ritz, Maier, Oberwinkler & Wissemann (2005a), Roskam (2009a), Ruszkiewicz-Michalska (2006a), Sadravi, Ono, Pei & Rahnama (2007a), Savchenko, Heluta, Wasser & Nevo (2014c), Schmid-Heckel (1985a), Schön (2014a), Scholler, Reinhard & Schubert (1996a), Termorshuizen & Swertz (2011a), Unamuno (1941b, 1942a), Vanderweyen & Fraiture (2007a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).

28/05/2017

mod 17.xi.2017