Anthracocystis eulaliae (L. Ling) McTaggart & R.G. Shivas

Synonyms

Sorosporium eulaliae L. Ling
Sporisorium eulaliae (L. Ling) Vánky

Description

Sori in ovaries, infecting all spikelets of an inflorescence, fusiform-ellipsoidal, 4–5 mm long, 0.5–1.0 mm wide, partly hidden by the glumes, at first covered by a brown peridium that lacerates into strips exposing the dark brown granular-powdery mass of spore balls surrounding a filiform simple or shortly branched central columella.

Spore balls globose, ellipsoidal to oblong or slightly irregular, 33–90 × 30–75 µm, dark reddish brown, composed of tens of spores that separate rather easily at maturity.

Spores variable in shape, size and colour, dimorphic. Outer spores globose, ellipsoidal, ovoid to irregular, 9.5–15.0 × 8–12 µm, dark reddish brown, prominently verrucose to echinulate on the free surface; wall uneven, 1–2 (–2.5) µm thick, thickest at the angles and on the free surface. Inner spores irregularly polyangular, 8–12 × 7.0–9.5 µm, ±hyaline to pale yellow; wall thin, c. 0.5 µm, apparently smooth to very finely punctate.

Sterile cells not seen between the spores.

Hosts
   
Host family: Poaceae
   
Host species: Eulalia trispicata (Schultes) Henrard

Distribution

States & Territories: QLD

Comments

Anthracocystis eulaliae is one of two species of smut fungi that have been found on Eulalia in Australia. The other, S. rarum, has much smaller spores (6.0–9.5 µm).