Tilletia robeana Vánky

Description

Sori in all ovaries of an inflorescence, ellipsoidal or lemon-shaped, 0.5–1.0 mm long, 0.5–0.8 mm wide, hidden by the floral envelopes and covered by the brown pericarp that ruptures at maturity exposing the black powdery mass of spores and sterile cells.

Spores globose, subglobose, ovoid to broadly ellipsoidal, 36–44 × 30–40 µm, medium to dark reddish brown, with blunt 2.5–4.0 µm high warts; in surface view showing as densely arranged irregularly polygonal dark areas, 10–16 per spore diameter.

Sterile cells subglobose, ovoid, ellipsoidal to irregular with flattened sides, 12–25 (–30) × 10–21 µm, subhyaline to pale yellow; wall 1.5–2.5 (–3.0) µm thick, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Polypogon monspeliensis (L.) Desf.

Distribution

States & Territories: SA