Ustilago radulans Vánky

Description

Sori in the distal part of the shoots, destroying the basal part of the leaf sheaths which swell to a few millimetres diam.; sori also occupying the main axis of the shoot, partly hidden by the congested leaves, at first covered by a thin grey membrane of host origin which ruptures irregularly exposing the powdery dark chocolate-brown spore masses.

Spores globose, subglobose, broadly ellipsoidal, ovoid, 10.0–14.5 (–15) × 9.5–14.0 µm, yellowish brown, distinctly echinulate; wall uniform, c. 1.5 µm thick, including the c. 1 µm high spines.

Hosts
   
Host family: Poaceae
   
Host species: Dactyloctenium radulans (R.Br.) P.Beauv.

Distribution

States & Territories: NSW, QLD, SA