Urocystis stipae McAlpine


Sori in leaves, leaf sheaths and stems, forming dark elongate streaks, at first covered by the epidermis which ruptures longitudinally exposing the blackish brown granular-powdery mass of spore balls.

Spore balls globose, subglobose, ellipsoidal, oblong or slightly irregular, 23–45 × 20–33 µm, light golden brown, composed of (1–) 2–8 (–9) spores and a complete or almost complete layer of sterile cells.

Spores globose, subglobose, ellipsoidal, elongate or irregular, with 1 or several flattened sides, 12.0–18.5 × 9.0–13.5 µm, golden brown.

Sterile cells variable in shape, 5.5–12.0 µm long, pale yellowish brown; wall 0.5–1.5 µm thick, collapsed in old specimens.

Host family: Poaceae
Host species: Austrostipa drummondii (Steud.) S.W.L.Jacobs & J.Everett
Austrostipa scabra (Lindl.) S.W.L.Jacobs & J.Everett


States & Territories: NSW, VIC


Urocystis stipae is one of three smut fungi that produce sori in the leaves and stems of Austrostipa spp. in Australia. The others, Fulvisporium restifaciens (D.E.Shaw) Vánky and Tranzscheliella hypodytes (Schltdl.) Vánky & McKenzie, are far more common.