Sporisorium centrale R.G. Shivas & Vánky

Description

Sori in all of spikelets of a raceme (awns absent), cylindrical, 8–12 mm long, c. 1 mm wide, mostly concealed by the glumes, covered by a thin grey to light brown peridium; columella solitary, stout, simple; spore mass black-powdery.

Spores when mature solitary, globose, subglobose, ovoid to subpolyhedrally irregular, 8–11 (–15) × 7.5–9.0 µm, reddish brown; wall uniformly c. 1 µm thick, moderately densely and finely punctate.

Sterile cells not seen.

Hosts
   
Host family: Poaceae
   
Host species: Themeda triandra Forssk.

Distribution

States & Territories: NT

Comments

This species infects all spikelets in a raceme, unlike racemes infected with S. punctatum (L.Ling) Vánky, which occasionally have awns indicating uninfected spikelets. However, the latter has not been recorded in Australia.