Anthracocystis tumefaciens (McAlpine) McTaggart & R.G. Shivas


Sorosporium tumefaciens McAlpine
Sphacelotheca rhaphidis L.Ling
Sporisorium tumefaciens (McAlpine) Vánky
Sporisorium tumiforme Vánky & R.G. Shivas


Sori destroying the entire inflorescence, swollen, broadly fusiform or long-cylindrical, 20–50 (–100) mm long, 5–10 mm wide, partly hidden by the uppermost leaf sheath, at first covered by a whitish to yellowish brown peridium that ruptures irregularly to expose the blackish brown granular-powdery mass of spore balls and numerous filiform columellae.

Spore balls subglobose, ellipsoidal or irregular, 30–80 (–100) × 30–70 µm, dark reddish brown, composed of tens to hundreds of readily separating spores.

Spores globose, ellipsoidal to subpolyhedrally irregular or elongate, 6.5–13.0 × (6–) 6.5–10.0 µm, yellowish brown; wall uniformly or slightly unevenly thick, 0.5–1.0 µm, apparently smooth to very finely and densely punctate, verruculose or finely verruculose-echinulate; spore profile smooth, wavy to finely serrulate.

Sterile cells few, in irregular groups; individual cells globose, ellipsoidal to slightly irregular, 9–23 µm long, hyaline; wall 0.5–1.0 µm thick, smooth.

Spore germination resulting in septate basidia bearing cylindrical 6–10 µm long basidiospores laterally and terminally.

Host family: Poaceae
Host species: Chrysopogon fallax S.T.Blake
Chrysopogon latifolius S.T.Blake
Chrysopogon pallidus (R.Br.) Trin. ex Steudel
Chrysopogon setifolius Stapf


States & Territories: NT, QLD, WA


Anthracocystis tumefaciens is similar to A. fallax in producing large sori (50 mm or longer) that destroy the inflorescence of some species of Chrysopogon. However, the spores of A. tumefaciens are not dimorphic (cf. A. fallax), and it exhibits a wide variation in the size and regularity of the spores and spore balls, as well as in the ornamentation of the spores.