Sporisorium ophiuri (Henn.) Vánky

Synonyms

Sphacelotheca flagellata (Syd. & P. Syd.) Zundel
Sphacelotheca ophiuri (Henn.) L. Ling
Sphacelotheca ophiuri-monostachydis Tay
Ustilago flagellata Syd. & P. Syd.
Ustilago ophiuri Henn.

Description

Sori destroying the entire inflorescence, long-cylindrical, 50–300 mm long, 2–3 mm wide, partly hidden by the terminal leaf sheath, at first covered by a greyish brown peridium that flakes away exposing the dark brown powdery mass of loose spore balls, spores and sterile cells surrounding a whip-like columella.

Spores when mature solitary, globose, subglobose, ovoid to slightly irregular, 9–14 × 8–12 µm, medium dark yellowish brown; wall uniformly c. 1 µm thick, finely and densely echinulate; spore profile finely serrulate.

Sterile cells in irregular groups, in chains, in pairs or solitary, usually collapsed in old specimens, 10–18 µm long, subhyaline; wall uniformly c. 0.5 µm thick, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Rottboellia cochinchinensis (Lour.) W.D.Clayton

Distribution

States & Territories: NT, QLD

Comments

Occurs on Rottboellia cochinchinensis in the NT and far-northern Qld; also on Chasmopodium, Hemarthria and Ophiuros in Africa and Indonesia.