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Elymus smut

Scientific Name
Ustilago bullata
Scientific Author
Berk.
Taxonomy
Basidiomycota, Ustilaginomycetes, Ustilaginales, Ustilaginaceae
Status
Exotic establishment in Australia
Reliability
High
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Diagnostic Images

Scanning electron micrograph
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Caption
Ustilago bullata on Elymus scaber - BRIP 47232. Scale bar = 1 µm
Source
Desley Tree DEEDI
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Diagnostic Images (3)
Diagnostic Notes
Sori completely destroying the spikelets, leaving intact the apical part of some floral envelopes of the distal flowers and their awns, 5–15 mm long, 1–2 mm wide, often extending down the floral axis and becoming confluent, occupying the whole spike, then up to 40 mm long or longer, at first lead-coloured, covered by a thin membrane of host origin which ruptures irregularly exposing the dark brown semi-agglutinated to powdery mass of spores which becomes scattered leaving the bare rachis of the inflorescence. Sori may also appear on the distal leaves as short or long bullate striae.

Spores globose, subglobose, ovoid or broadly ellipsoidal, 8.0–10.5 × 7–9 µm, olivaceous brown; wall uniformly c. 0.8 µm thick, in LM coarsely low-verrucose, spore profile wavy, in SEM densely verrucose-echinulate.
More Information
Specimen Contact
Roger Shivas
Author
Roger Shivas
Created
16/12/2010 12:00 AEST
Last Updated
16/12/2010 12:00 AEST
Citation
Roger Shivas (2010) Elymus smut (Ustilago bullata) Updated on 12/16/2010 12:00:10 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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