Tilletia sehimicola R.G. Shivas & McTaggart

Description

Sori completely destroying one or a few ovaries in an inflorescence, ellipsoidal to hemi-ellipsoidal (flattened on one side and convex on the opposite side), 3–9 × 1.5–4.0 mm, with remnants of the stigmas attached to an acute apex, covered by a persistent, grey to pale brown perideum that ruptures irregularly releasing the black powdery spore mass mixed with sterile cells.

Spores globose, subglobose, broadly ellipsoidal or subpolyhedrally irregular, often with 1 or more flattened sides, 22–30 × 18–28 µm, dark brown to opaque, wall c. 3.0 µm thick, with dense, coarse, irregular, blunt projections, 1.5–2.5 µm high, apparent in surface view as dark rounded or polygonal areas, isolated or 2–several confluent, 14–20 per spore diameter; 40–50 on the equatorial circumference in optical median view; spore profile sinuate, dentate or lacinate.

Sterile cells globose, ovoid, ellipsoidal to irregular with slightly flattened sides, rarely with a short papilla, (14–)22–35 × 12–32 µm diameter, subhyaline to pale brown; wall uneven, 2–6 µm thick, densely verucculose, spore profile minutely serrate; intermediate cells (? immature spores) common.

Hosts
   
Host family: Poaceae
   
Host species: Sehima nervosum (Rottler) Stapf.

Distribution

States & Territories: NT