Anthracocystis horsfallii (Vánky) McTaggart & R.G. Shivas


Sporisorium horsfallii Vánky


Sori either in all flowers of an inflorescence, leaving intact the outermost floral envelopes, long-cylindrical or fusiform and 5–10 mm long and 1.0–1.5 mm wide, or destroying the entire inflorescence, then larger (c. 35–45 mm long and 2 mm wide), initially covered by a yellowish brown peridium that ruptures irregularly exposing the dark brown granular-powdery mass of spore balls and a simple flagelliform columella as long as the sorus.

Spore balls globose, ellipsoidal, elongate or irregular, 50–130 × 40–80 µm, reddish brown, composed of many readily separating spores.

Spores globose, subglobose, usually broadly ellipsoidal to slightly subpolyhedrally irregular, 8–10 × 6.5–9.5 µm, yellowish brown; wall uniformly c. 0.5 µm thick, very finely punctate to verrucose; spore profile smooth to very finely wavy.

Sterile cells not seen.

Host family: Poaceae
Host species: Paspalidium rarum (R.Br.) Hughes


States & Territories: NT