Sporisorium simile R.G. Shivas & J. Walker

Description

Sori destroying all racemes of an inflorescence, 10–20 mm long, initially covered by a thick creamy white peridium that later ruptures exposing the dark brown powdery mass of spore balls, spores and sterile cells surrounding a repeatedly branched columella with tapering branches.

Spores when mature solitary, globose, subglobose to broadly ellipsoidal, 8.0–10.5 × 6.5–9.0 µm, brown; wall uniformly c. 1 µm thick, prominently echinulate; spore profile serrulate.

Sterile cells in variously sized irregular groups; individual cells 9–16 µm diam.

Spore germination resulting in phragmobasidia on which ovoid to elongate-cylindrical basidiospores are produced laterally and terminally.

Hosts
   
Host family: Poaceae
   
Host species: Chionachne hubbardiana Henrard

Distribution

States & Territories: WA