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Dichanthium Smut

Scientific Name
Jamesdicksonia brunkii
Scientific Author
(Ellis & Galloway) J. Walker & R.G. Shivas
Basidiomycota, Exobasidiomycetes, Georgefischeriales, Georgefischeriaceae
Native Australian Species

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Light micrograph

Diagnostic Notes

**Sori** on adaxial surface of leaf sheaths, forming striae fusing into a blackish brown agglutinated to granular-powdery coat of spore masses, showing through the outer surface of the leaf sheaths between the veins as pale lead-coloured striae of varying length. **Spores** globose, subglobose to ovoid (subpolyhedrally irregular in some specimens), 10–20 (–24) × 10–18 µm, yellow to dark reddish brown; wall 3–8 µm thick, consisting of a homogenous endospore 1–2 µm thick and a smooth multilayered exospore, sometimes with a short hyaline papilla. [Spore measurements made in unheated lactophenol; in heated lactophenol or in water the spore wall and the spores swell considerably.] **Spore germination** resulting in holobasidia producing 4–8 apical allantoid to fusiform symmetrical septate basidiospores that do not fuse but germinate apically to produce ballistoconidia. Asymmetrical ballisto-basidiospores also produced on basidial sterigmata.