Cintractia amazonica Syd. & P. Syd.


Cintractia rhynchosporae Cif.


Sori usually infecting all spikelets of an inflorescence, globose to ovoid, 1–2 mm long, 1.0–1.5 mm wide, initially isolated, later ± confluent, black, agglutinated with a powdery surface.

Spores globose, subglobose, rarely slightly irregular, laterally flattened, (7–) 8–12 µm wide, in plane view (13.5–) 14.0–18.5 × 13.0–17.5 µm, reddish brown; wall 0.5–1.0 µm thick, thinner on the flattened sides, in LM smooth, in SEM finely and irregularly verruculose, the warts confluent, forming an irregular pattern.

Spore germination resulting in phragmobasidia; basidial cells conjugating, producing 2 large dikaryotic conidia.

Host family: Cyperaceae
Host species: Rhynchospora corymbosa (L.) Britton
Rhynchospora heterochaeta S.T.Blake
Rhynchospora leae C.B.Clarke
Rhynchospora longisetis R.Br.
Rhynchospora submarginata Kük.


States & Territories: NT, QLD, WA