Urocystis poae (Liro) Padwick & Khan


Tuburcinia poae Liro


Sori in leaves and sheaths, appearing as long streaks, at first lead-coloured and covered by the epidermis which ruptures longitudinally exposing the dark brown powdery mass of spore balls; infected plants remaining sterile.

Spore balls globose, subglobose to ovoid, 16–36 µm diam., composed of 1–2 (–4) central spores and a continuous layer of peripheral sterile cells.

Spores globose, subglobose to slightly irregular, 12–16 (–17) × 10.5–13.5 µm diam., light brown; wall c. 0.8 µm thick, smooth.

Sterile cells globose to irregular, 5–12 µm diam., yellow, smooth.

Host family: Poaceae
Host species: Poa caespitosa Forst.


States & Territories: VIC


McAlpine (1910: 198) recorded this smut as U. occulta (Wallr.) Rabenh. ex Fuckel on Poa caespitosa. The name Poa caespitosa has been used in Australia for many different forms and represents a complex of species.