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Digitaria smut

Scientific Name
Sporisorium ugandense
Scientific Author
(Henn.) Vánky
Taxonomy
Basidiomycota, Ustilaginomycetes, Ustilaginales, Ustilaginaceae
Status
Native Australian Species
Reliability
High
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Diagnostic Images

Host symptoms
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Caption
Sporisorium ugandense on Digitaria diffusa - DAR 57248. Scale bar = 5 mm
Source
Roger Shivas DEEDI
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Diagnostic Images (3)
Diagnostic Notes
Sori destroying the distal part of sterile shoots and transforming them into elongate-linear curved and distorted narrowing bodies 40–110 mm long and 0.5–2.0 mm wide, partly hidden by the uppermost leaf sheath, at first covered by the thin grey host epidermis which disintegrates from the apex to expose a dark brown semi-agglutinated to dusty mass of loose spore balls and spores destroying the parenchymatous host tissues and leaving intact the vascular fascicles as numerous (6 or more) filiform columellae. Sori maturing from their apices where only fascicles of vascular bundles may be present, the basal part of the sori remaining immature.

Spore balls globose, ovoid, ellipsoidal, elongate or slightly irregular, 30–65 (–80) × 30–50 µm, reddish brown, composed of 20–80 (or more?) readily separating spores.

Spores globose, ovoid, ellipsoidal to usually rounded subpolyhedrally irregular, 7–12 × 7.0–9.5 µm, yellowish brown; wall uniformly c. 0.5 µm thick, finely and moderately densely punctate-verruculose; ornamentation scarcely affecting the spore profile.

Sterile cells few or lacking, in small groups; individual cells globose or irregular, 9–14 × 7–12 µm, hyaline; wall c. 0.5 µm thick, smooth.
More Information
Specimen Contact
Roger Shivas
Author
Roger Shivas
Created
09/12/2010 01:21 AEST
Last Updated
09/12/2010 13:21 AEST
Citation
Roger Shivas (2010) Digitaria smut (Sporisorium ugandense) Updated on 12/9/2010 1:21:39 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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