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Cymbopogon smut

Scientific Name
Sporisorium cymbopogonis-bombycini
Scientific Author
R.G. Shivas & Vánky
Basidiomycota, Ustilaginomycetes, Ustilaginales, Ustilaginaceae
Native Australian Species

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Diagnostic Images

Light micrograph
Sporisorium cymbopogonis-bombycini on Cymbopogon bombycinus - PERTH 00927260. Scale bar = 10 µm
Roger Shivas DEEDI
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Diagnostic Images (4)
Diagnostic Notes
Sori destroying the spikelets (usually every spikelet in a raceme, but only a few racemes in an inflorescence are infected), long-linear, to 15 mm long, c. 1 mm wide, partly hidden by floral envelopes and spatheoles, covered by a yellowish brown peridium that splits longitudinally at maturity into several bands, exposing the black granular-powdery mass of spore balls surrounding several filiform columellae.

Spore balls globose, ovoid, oblong to subpolyhedrally irregular, 50–125 × 40–80 µm, reddish brown to subopaque, composed of tens of spores that separate readily by pressure.

Spores globose, subglobose, ellipsoidal to rounded or subpolyhedrally irregular, dimorphic. Outer spores 9.5–14.5 × 9–13 µm, medium dark yellowish or reddish brown; wall uneven, 0.5–1.5 µm thick, with alternating thin and thicker areas, with a thin rounded area (germ pore?) in the centre of the free wall; contact sides smooth or nearly so; free surface moderately to densely punctate-verrucose; spore profile wavy to finely serrulate, in SEM warts low, variable in size, blunt or subacute. Inner spores 8.5–13.5 × 8–11 µm, pale yellowish brown, wall thin, c. 0.5 µm, even or slightly unevenly thick, smooth.

Sterile cells absent.
More Information
Specimen Contact
Roger Shivas
Roger Shivas
22/11/2010 04:14 AEST
Last Updated
23/11/2010 15:27 AEST
Roger Shivas (2010) Cymbopogon smut (Sporisorium cymbopogonis-bombycini) Updated on 11/23/2010 3:27:05 PM Available online: PaDIL -
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Free for use under the Creative Commons Attribution 3.0 Australia License