Microbotryum prostratum (Vánky & Oberw.) Vánky


Ustilago prostrata Vánky & Oberw.


Sori in swollen and deformed flowers that contain a dark purplish brown powdery mass of spores.

Spores globose, subglobose to ovoid, 9.5–12.0 (–13.5) × 9–11 µm, violet-tinted light brown; wall 1.2–1.5 µm thick, reticulate, 3–5 meshes per spore diameter; meshes mostly pentagonal or hexagonal, (2.0–) 2.5–4.0 (–5.5) µm diam., incomplete meshes sometime present; muri 0.5–1.0 µm high, in median view with blunt edges; in SEM the convex interspaces irregularly warty.

Host family: Polygonaceae
Host species: Persicaria prostrata (R.Br.) Sojak


States & Territories: ACT, NSW, SA, TAS, VIC