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Lyginia Smut

Scientific Name
Websdanea lyginiae
Scientific Author
(Websdane, Sivasithamparam, K.W. Dixon & Pate) Vánky
Taxonomy
Basidiomycota, Ustilaginomycetes, Ustilaginales, Websdaneaceae
Status
Native Australian Species
Reliability
High
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Diagnostic Images

Host symptoms
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Caption
Websdanea lyginiae on Lyginia barbata - BRIP 26822. Scale bar = 5 mm.
Source
Roger Shivas DEEDI
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Diagnostic Images (3)
Diagnostic Notes
Sori as bullate dark reddish brown striae on the distal internodes of the culms, c. 1–50 mm long and 1 mm wide, covered by the epidermis which ruptures at maturity exposing the black granular-powdery mass of irregular loose spore balls. Swollen sori developing in longitudinal depressions in the culm, beginning from a ±narrow isthmus of sporogenous hyphae and host cells permeated by inter- and intracellular hyphae. Groups of spore balls differentiating within the basal sporogenous hyphae of young sori; during maturation these are pushed toward the periphery. When young, groups of spore balls separated into irregular lobes by fascicles of sporogenous hyphae that penetrate into the sori. During maturation, these fascicles disappear towards the periphery. Infection systemic; usually all culms of a plant affected; smutted culms sterile.

Spore balls subglobose, ovoid to usually irregularly elongate, 45–200 × 30–90 µm, dark olivaceous brown, opaque, composed of many readily separating spores.

Spores subglobose, ovoid, irregularly subpolyhedral or polyhedral, elongate, often prolonged into 1 or 2 subacute or acute tips, (6–) 7–13 (–16) × (5–) 6–9 µm, olivaceous brown; wall unevenly thick, 0.5–1.5 µm; in LM smooth; in SEM outer spores inconspicuously low-verruculose, inner spores smooth.

Spore germination resulting in (1–) 2–4-celled basidia c. (6–) 20–40 × 1.5 µm. Basidiospores fusiform or ovoid, produced successively on well-developed sterigmata, 3.5–12.0 × 1.0–1.5 µm; basidiospores budding and giving rise to smaller fusiform or ovoid cells or hyphae. Alternatively, richly branched hyphae produced on the basidia, with only a few ovoid basidiospores at the tips of short or long branches.
More Information
Specimen Contact
Roger Shivas
Author
Roger Shivas
Created
08/12/2010 11:41 AEST
Last Updated
08/12/2010 11:41 AEST
Citation
Roger Shivas (2010) Lyginia Smut (Websdanea lyginiae ) Updated on 12/8/2010 11:41:20 AM 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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