Puccinia cyani Passerini, 1874

on Cyanus

Puccinia cyani on Cyanus segetum

Cyanus segetum, Belgium, prov. Antwerp, Mol, 14.v.2019 © Carina Van Steenwinkel

Puccinia cyani: uredinia on Cyanus segetum

uredinia

Puccinia cyani: urediniospores

urediniospores

Puccinia cyani: urediniospores

urediniospores trapped in an air bubble, better showing the surface ornamentation

Puccinia cyani: urediniospores

urediniospores

Puccinia cyani: telia on Cyanus segetum

telia

Puccinia cyani: teliospores

teliospores

Puccinia cyani: teliospores

teliospores

Puccinia cyani on Cyanus segetum

Cyanus segetum, Loenen (Ge.), 18.vi.2013 © Arnold Grosscurt

Puccinia cyani on Cyanus segetum

also the stems are affected

Puccinia cyani on Cyanus segetum

leaf with telia

Puccinia cyani on Cyanus segetum

stem with uredinoid aecia (brown) and telia (black)

gall

No host plant alternation. Spermogonia honey coloured. The first formed uredinia on leaves and stems, later ones only (amphigenous) on the leaves, pulverulent, dark cinnamon brown. Urediniospores spinulose with 2 equatorial germination pores that are not surrounded by a smooth zone. Telia on all parts of the plant, black, pulverulent. Teliospores 2-celled, on a short, fragile pedicel.

host plants

Asteraceae, narrowly monophagous

Cyanus segetum.

Gäumann additionally mentions as a host plant Centaurea cana [= Cyanus triumfetii subsp. axillaris]. Also on cultivated cornflowers.

references

Buhr (1964b), Dauphin & Aniotsbehere (1997a), Ellis & Ellis (1997a), Gäumann (1959a), Gjaerum (1986a), González Fragoso (1924a), Hafellner (1980a), Henderson (2000a, 2004a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Poelt & Zwetko (1997a), Redfern & Shirley (2011a), Riegler-Hager (2007a), Roskam (2009a), Termorshuizen & Swertz (2011a), Tomasi (2014a), Unamuno (1941b), Vanderweyen & Fraiture (2011a), Wilson & Henderson (1966a).

mod 20.vii.2019