Anthracocystis xerofasciculata (R.G.Shivas, A.R.McTaggart & Vánky) McTaggart & R.G. Shivas

Synonyms

Sporisorium xerofasciculatum R.G.Shivas, A.R.McTaggart & Vánky

Description

Sori destroying the unit inflorescences, comprising all (1–4) spikelets and the woolly rachis, leaving intact the floral bracts, appearing as a cylindrical often curved body, 10–25 mm long and 2–5 mm wide, protruding beyond the coriaceous spathe, covered by a thick grey peridium that ruptures irregularly exposing the blackish brown powdery mass of loose spore balls, spores and few sterile cells surrounding numerous (more than 10) long filiform columellae.

Spores when mature solitary, globose, subglobose, ellipsoidal to subpolyhedrally slightly irregular, 5.5–10.5 × 5.0–9.0 µm, yellowish brown; wall uniformly thick to slightly uneven, 0.5–0.8 µm, finely and moderately densely verruculose; spore profile smooth to finely serrulate.

Sterile cells solitary, in irregular groups, in rows or fascicles of chains; individual cells globose, ellipsoidal, elongate, irregular with flattened sides, 6.5–11.0 µm long, hyaline; wall c. 0.5 µm thick, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Xerochloa barbata R.Br
Xerochloa laniflora F.Muell. ex Benth.

Distribution

States & Territories: WA

Comments

A specimen of a single sorus of a Sporisorium sp. (DAR 67544, PERTH 1359002) on
X. laniflora, collected in Western Australia in 1937, has spore balls with dark reddish brown spores that may represent an undescribed species. Further collections of this smut fungus are required to determine its identity and that of its host.