Ustilago cynodontis (Henn.) Henn.

Synonyms

Sporisorium agropyri Bag & D.K. Agarwal
Ustilago carbo var. cynodontis Pass.
Ustilago cynodontis (Pass.) Curzi
Ustilago segetum var. cynodontis Henn.

Description

Sori in the inflorescence, destroying the spikelets and covering the spikes with a dark brown dusty spore mass; sometimes infection is localised in the basal parts of the inflorescence, usually with abortive spikelets in its distal parts; immature sori often ±hidden by enveloping leaf sheaths. Infection systemic.

Spores globose to subglobose, 6.0–8.0 (–8.5) × 5.5–8.0 µm, yellowish brown to light olivaceous brown, smooth; in SEM with dense low warts. Immature spores often in readily separable chains, connected by minute hyaline hyphal remnants.

Spore germination: 4-celled basidia (in 3 + 1 arrangement) producing successive lateral and terminal ovoid to long-ellipsoidal basidiospores. Basidiospores budding or germinating by hyphae on which lateral or terminal aerial sporidial systems develop.

Hosts
   
Host family: Poaceae
   
Host species: Cynodon dactylon (L.) Pers.

Distribution

States & Territories: ACT, NSW, NT, QLD, SA, VIC, WA