Urocystis agropyri (Preuss) A.A. Fisch. Waldh.

Synonyms

Polycystis agropyri (Preuss) J. Schröt.
Tuburcinia agropyri (Preuss) Liro
Tuburcinia agropyri-juncei Vienn.-Bourg.
Uredo agropyri Preuss
Urocystis agropyri-juncei (Vienn.-Bourg.) Zogg
Urocystis preussii J.G.Kühn

Description

Sori in leaves, sheaths and culms, often in the rachis of the aborted inflorescence, short to long streaks parallel to the veins, at first lead-coloured and covered by the epidermis which soon ruptures to expose the dark brown dusty spore mass.

Spore balls globose to elongate, 16–32 µm long, composed of 1–3 (–5) spores with a complete or ±complete cortex of sterile cells.

Spores globose, subglobose or ovoid, sometimes with flattened sides, 12.0–17.5 × 9.5–15.0 µm, reddish brown, smooth.

Sterile cells hyaline to yellowish, 4–12 µm diam.; outer wall thin, c. 1 µm, collapsing with age giving a ridged appearance to the spore ball surface.

Spore germination resulting in aseptate basidia usually with 4 apical cylindrical basidiospores that fuse in pairs to form dikaryotic hyphae.

Hosts
   
Host family: Poaceae
   
Host species: Elymus scaber (R.Br.) A.Love
Elytrigia repens (L.) Nevski

Distribution

States & Territories: NSW, QLD, SA, TAS, VIC