Tilletia eragrostidis G.P. Clinton & Ricker

Description

Sori in some ovaries of an inflorescence, visible between the spreading floral envelopes as inconspicuous ovoid bodies 0.8–1.4 mm long and 0.3–0.8 mm wide, at first covered by the thin pericarp that ruptures irregularly to expose the blackish brown semi-agglutinated to powdery mass of spores and sterile cells.

Spores globose, subglobose, ovoid to ellipsoidal, 28–40 × 25–36 µm, yellowish to dark reddish brown, opaque in some collections; wall 3.5–7.0 µm thick, including the 2.5–5.5 µm high truncate warts that appear, in surface view, as darker densely arranged irregularly polygonal areas, 6–10 per spore diameter.

Sterile cells globose, ellipsoidal to irregularly polyhedral, 16–30 × 14–25 µm, subhyaline to pale yellowish brown; wall 3–5 µm thick, smooth to finely punctate.

Hosts
   
Host family: Poaceae
   
Host species: Eragrostis tenellula (Kunth) Steudel

Distribution

States & Territories: QLD

Comments

Tilletia eragrostidis is likely to be more widespread in Australia as the sori are inconspicuous and difficult to detect.