Anthracocystis destruens (Schltdl.) Bref.

Synonyms

Caeoma destruens Schltdl.
Erysibe panicorum β panici-miliacei (Pers.) Wallr.
Sorosporium panici-miliacei (Pers.) Takah.
Sphacelotheca destruens (Schltdl.) J.A. Stev. & Aar.G. Johnson
Sphacelotheca panici-miliacei (Pers.) Bubák
Sporisorium destruens (Schltdl.) Vánky
Tilletia destruens (Schltdl.) Lév.
Uredo carbo δ panici-miliacei (Pers.) DC.
Uredo destruens (Schltdl.) Duby
Uredo segetum δ Uredo panici-miliacei Pers.
Ustilago destruens Schltdl.
Ustilago panici-miliacei (Pers.) G. Winter

Description

Sori occupying the entire inflorescence which is completely destroyed, ovoid to elongate, 30–60 mm long, 5–20 mm wide, partly concealed by leaf sheaths and covered by a well-developed whitish peridium that ruptures irregularly and flakes away to expose the dark brown dusty spore mass, sterile cells and numerous long filiform columellae composed of host tissues (mainly vascular bundles) and hyphae. Infection systemic, initiated in the seedling stage of the host.

Spore balls loose, ephemeral.

Spores solitary when mature, subglobose, ovoid to elongate or irregular, 8–13 × 7–9 µm, light reddish brown; wall uniformly thick or nearly so, c. 0.5 µm, smooth to very finely punctate; spore profile smooth; in SEM very finely and densely verruculose.

Sterile cells between the spores, subhyaline or pale yellow, thin-walled, almost the size of the spores.

Spore germination resulting in 4-celled basidia. In water, basidial cells fuse and produce mycelia; in nutrient media abundant basidiospores are produced.

Hosts
   
Host family: Poaceae
   
Host species: Panicum miliaceum L.

Distribution

States & Territories: QLD

Comments

Anthracocystis destruens causes head smut of Panicum miliaceum (broom corn millet, French millet), which is cultivated in Australia mostly for the bird seed trade. Head smut is rarely a problem.