1. PaDIL Species Factsheet

Scientific Name: Sporisorium cymbopogonis-bombycini R.G. Shivas & Vánky Basidiomycota, Ustilaginomycetes, Ustilaginales, Ustilaginaceae

Common Name smut Live link: http://www.padil.gov.au/aus-smuts/Pest/Main/139956

Image Library Smut Fungi of Live link: http://www.padil.gov.au/aus-smuts/

Partners for Smut Fungi of Australia image library

Queensland Government https://www.daf.qld.gov.au/ 2. Species Information

2.1. Details Specimen Contact: Roger Shivas - [email protected] Author: Roger Shivas Citation: Roger Shivas (2010) Cymbopogon smut(Sporisorium cymbopogonis-bombycini)Updated on 11/23/2010 Available online: PaDIL - http://www.padil.gov.au Image Use: Free for use under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY- NC 4.0)

2.2. URL Live link: http://www.padil.gov.au/aus-smuts/Pest/Main/139956

2.3. Facets Columella: present Distribution: WA Host Family: Peridium: present Sorus position: Sorus shape: long cylindrical Spore balls: present Spore mass texture: granular, powdery Spore shape: globose or subglobose, irregular, ovoid to ellipsoidal, polyhedral or subpolyhedral Spore surface ornamentation: punctate, smooth, verruculose Status: Native Australian Species Sterile cells: absent

2.4. 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. 3. Diagnostic Images

Sporisorium cymbopogonis-bombycini on Sporisorium cymbopogonis-bombycini on Cymbopogon bombycinus - BRIP 52511. Cymbopogon bombycinus - BRIP 26809. Field photo: Alistair McTaggart DEEDI Scale bar = 1 cm Host symptoms: Roger Shivas DEEDI

Sporisorium cymbopogonis-bombycini on Sporisorium cymbopogonis-bombycini on Cymbopogon bombycinus - PERTH Cymbopogon bombycinus - BRIP 26809. 00927260. Scale bar = 10 µm Scale bar = 1 µm Light micrograph: Roger Shivas DEEDI Scanning electron micrograph: Desley Tree DEEDI

Results Generated: Saturday, October 2, 2021