Anthracocystis confusa (Massee) McTaggart & R.G. Shivas

Synonyms

Sorosporium chamaeraphis Syd.
Sporisorium chamaeraphis (Syd.) Vánky
Sporisorium shivasii Vánky
Ustilago confusa Massee

Description

Sori in completely destroying the inflorescence, 10–20 mm long, 2–3 mm wide, partially concealed by the uppermost leaf sheath, at first covered by a brownish peridium that flakes away revealing a dark brown, initially agglutinated later granular-powdery mass of spore balls mixed with long filiform columellae.

Spore balls subglobose, ellipsoidal or elongate, rarely irregular, 30–70 (–80) × 30–50 (–60) µm, dark reddish brown, composed of 15–100 or more readily separating spores.

Spores usually subpolyhedrally irregular, more rarely subglobose or broadly ellipsoidal, 9–13 (–14) × 7–11 µm, yellowish brown to reddish brown; wall slightly uneven, 1.0–1.5 µm thick, thickest at the angles, finely and densely punctate; free surfaces of the peripheral spores in a ball finely and densely verrucose-echinulate, causing the spore profile to appear finely wavy to serrulate.

Sterile cells not seen.

Hosts
   
Host family: Poaceae
   
Host species: Pseudoraphis spinescens (R.Br.) Vickery
Pseudoraphis paradoxa (R.Br.) Pilger

Distribution

States & Territories: NSW, NT, QLD, SA, VIC

Comments

McAlpine (1910: 179) reported this smut under the name S. panici-miliacei (Pers.) Takah. There is one other smut, A. anthracoideispora, recorded on Pseudoraphis in Australia. The two can be differentiated in that A. confusa destroys the entire inflorescence whereas A. anthracoideispora is restricted to the ovaries and florets.