Sporisorium queenslandicum Vánky

Description

Sori destroying the entire raceme, long-cylindrical or fusiform, 30–60 mm long, 1.0–1.5 mm wide, at first hidden by the terminal leaf sheath and covered by a thin greyish peridium, later protruding, the peridium flaking away, the dark brown powdery mass of loose spore balls, spores and sterile cells being scattered leaving behind a long stout simple flagelliform columella, sometimes with a few short lateral branches.

Spore balls of many spores, ephemeral.

Spores globose, subglobose or ellipsoidal, 5.5–10.0 × 5.5–9.0 µm, yellowish brown; wall uniformly c. 0.5 µm thick, finely and densely punctate to echinulate; spore profile smooth to finely serrulate.

Sterile cells in smaller or larger groups; single cells variable, subglobose, ellipsoidal or irregular with flattened sides, 5–16 (–20) × 5–16 µm, hyaline to pale yellowish brown; wall c. 0.5 µm thick, smooth.

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

Distribution

States & Territories: QLD, WA

Comments

Sporisorium queenslandicum destroys the entire inflorescence of its host, a character that distinguishes it from the two other Sporisorium species that infect Sehima in Australia.