Phragmidium fragariae Winter, 1884

on Drymocallis, Potentilla

Phragmidium fragariae: aecia on Potentilla sterilis

Potentilla sterilis, England, East Gloucestershire, VC33: aecia © Malcolm Storey, BioImages

Phragmidium fragariae on Potentilla sterilis

Potentilla sterilis, Amstelveen, Thijsse-park: infected leaf.

Phragmidium fragariae: uedinia and telia on Potentilla sterilis

uredinia and telia at the underside of the leaf

Phragmidium fragariae on Potentilla sterilis: urediniun

uredinium

Phragmidium fragariae on Potentilla sterilis: empty uredinium

the uredinia are surrounded by sterile hyphae; they form a ring after the spores have been shed

Phragmidium fragariae on Potentilla sterilis: urediniospores

urediniospore

Phragmidium fragariae on Potentilla sterilis: telium

telium

Phragmidium fragariae on Potentilla sterilis: teliospores

teliospores

gall

no alternation of hostplant. Spermogonia epiphyllous, between epidermis and cuticula, often near the aecia. Aecia mostly hypophyllous, yellow, minute but larger on the veins, without a peridium but with a coronet of hyaline, sausage-shaped curved paraphyses; spores produced in chains, densely verrucose. Uredinia like the aecia, but spores single, pedicellate, strongly verrucose; the spores dry out quickly, and then look whitish. Telia hypophyllous black; spores long pedicellate, elliptic, dark brown, transversely divided into c. 4 almost smooth cells, the terminal one rounded, without an apiculus.

hostplants

Rosaceae, narrowly oligophagous

Drymocallis rupestris; Potentilla alba, alchemilloides, argentea, ?caulescens, carniolica, grandiflora, lineata, micrantha, montana, nevadensis, patula, pyrenaica, sterilis.

Niet op Fragaria (Klenke & Scholler). The references to that host in Termorshuizen &Swertz probably concern P. sterilis, that has a treacherous similarity with F. vesca.

synonyms

Phragmidium fragariastri (de Candolle) Schröter, 1887; Ph. granulatum Fuckel, 1869.

references

Bahcecioglu & Kabaktepe (2012a), Ellis & Ellis (1997a), Gäumann (1959a), González-Fragoso (1925a), Helfer (2005a), Henderson (2000a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a), Maier, Begerow, Weiß & Oberwinkler (2003a), Mayor (1973a), Petrova & Denchev (2004a), Poelt & Zwetko (1997a), Riegler-Hagler (2002a,b), Ritz, Maier, Oberwinkler & Wissemann (2005a), Scheuer & Bechter (2012a), Termorshuizen & Swertz (2011a), Tóth (1994a), Vanderweyen & Fraiture (2007a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).

23/04/2017

mod 11.xi.2017