Sporisorium lepturi (Thüm.) Vánky

Synonyms

Cintractia densa McAlpine
Sphacelotheca densa (McAlpine) Cif.
Sphacelotheca rottboelliae (Syd. & P. Syd. & Butler) Mundk.
Ustilago carbo var. lepturi Thüm.
Ustilago lepturi (Thüm.) Henn.
Ustilago rottboelliae Syd. & P. Syd. & Butler

Description

Sori occupying the entire inflorescence, cylindrical, 15–30 mm long, 1–2 mm wide, at first covered by a greyish brown fungal peridium that ruptures irregularly and flakes away exposing the dark brown powdery mass of spores, finally leaving behind a well-developed central columella of host origin.

Spores when young in irregular many-spored balls, later solitary, subglobose, ovoid to slightly irregular, 6–9 (–10) × 5.5–8.0 µm, light olive-brown; wall thin, c. 0.5 µm, apparently smooth to very finely and sparsely punctate.

Sterile cells in irregular groups between the spores; single cells larger than the spores, hyaline, smooth.

Spore germination resulting in septate basidia bearing elongate basidiospores laterally and terminally.

Hosts
   
Host family: Poaceae
   
Host species: Hemarthria compressa (L.f.) R.Br.
Hemarthria uncinata R.Br.

Distribution

States & Territories: ACT, NSW, QLD, SA, TAS, VIC