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Themeda smut

Scientific Name
Sporisorium exsertum
Scientific Author
(McAlpine) L. Guo
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 exsertum on Themeda triandra - BRIP 44303. Scale bar = 1 cm
Source
Roger Shivas DEEDI
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Diagnostic Images (4)
Diagnostic Notes
Sori occupying entire racemes, 4–16 mm long, 1–2 mm wide, cylindrical but often with short adpressed lateral spikelet-like branches, at first covered by a yellowish brown peridium that flakes away exposing a central branched columella surrounded by a blackish brown agglutinated mass of large irregular readily disintegrating many-spored spore balls (of up to several hundred spores) mixed with small groups or chains of sterile cells.

Spores globose, ovoid to subpolyhedrally irregular, 6.0–9.5 × 5.5–8.0 µm, yellowish brown; wall uniformly 0.5–0.8 µm thick; ornamentation depending on initial position of the spore in a spore ball, from apparently smooth to very finely or distinctly and moderately densely punctate-verruculose.

Sterile cells subglobose to irregular, larger than the spores, 8–18 µm long, collapsed in old specimens, subhyaline; wall 1.0–1.5 µm thick, smooth.
More Information
Specimen Contact
Roger Shivas
Author
Roger Shivas
Created
23/11/2010 01:17 AEST
Last Updated
23/11/2010 15:32 AEST
Citation
Roger Shivas (2010) Themeda smut (Sporisorium exsertum) Updated on 11/23/2010 3:32:09 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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