Anthracocystis paspali-thunbergii (Henn.) McTaggart & R.G. Shivas

Synonyms

Sorosporium paspali McAlpine
Sorosporium paspali var. verrucosum Thirum. & M.S. Pavgi
Sorosporium paspali-thunbergii (Henn.) S. Ito
Sporisorium paspali-thunbergii (Henn.) Vánky
Ustilago paspali-thunbergii Henn.

Description

Sori destroying the entire inflorescence, long-cylindrical, 50–150 mm long, 1.5–3.0 (–4) mm wide, often twisted, partly hidden by the terminal leaf sheath, at first covered by a thick greyish to brown peridium that ruptures irregularly and flakes away exposing the blackish brown mass of spore balls and spores surrounding a long filiform often undulate columella, sometimes with short lateral branches on its distal part. Rarely, sori restricted to the spikelets.

Spore balls globose, ovoid, long-ellipsoidal or slightly irregular, 30–60 × 25–40 µm, dark reddish brown, composed of (5–) 8–40 or more? spores that separate easily.

Spores subglobose, ellipsoidal, usually slightly subpolyhedrally irregular, (10.5–) 13–17 (–20) × (8–) 9–12 (–14.5) µm, reddish brown; wall uneven, thickest at the angles, 0.5–1.5 (–2) µm, from apparently smooth to punctate or finely and densely verruculose, especially on the free surface of the spores; spore profile smooth.

Sterile cells absent.

Hosts
   
Host family: Poaceae
   
Host species: Paspalum dilatatum Poiret
Paspalum scrobiculatum L.

Distribution

States & Territories: QLD

Comments

Collections of A. paspali-thunbergii show considerable variation in spore dimensions. However, the morphology of the sori and other spore characters are reliable and enable this species to be readily identified.