Tilletia viennotii H. Sydow


Sori in all ovaries of an inflorescence, ovoid, c. 2.0–2.5 mm long and 1.5 mm wide, completely hidden by the floral envelopes, at first covered by a thin greyish brown membrane (pericarp) that ruptures irregularly exposing the dark brown powdery foetid mass of spores and sterile cells; infected plants can be slightly stunted and are recognised by the somewhat spreading floral envelopes.

Spores globose, subglobose, ovoid to broadly ellipsoidal, 21.5–28.0 (–30.0) × 21–26 (–28) µm, yellowish brown, reticulate, often incompletely so, 6–9 meshes per spore diameter; muri 2–3 (–4) µm high.

Sterile cells globose, subglobose, ellipsoidal or slightly irregular, 12–24 × 12–23 µm, hyaline; wall uniformly 0.5–2.5 µm thick, smooth.

Host family: Poaceae
Host species: Briza maxima L.
Briza minor L.


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