Ustilago serena Syd.

Synonyms

Tranzscheliella serena (Syd.) Vánky

Description

Sori surrounding the uppermost culms, partly hidden by leaf sheaths, at first covered by a delicate grey or lead-coloured peridium that flakes away exposing the olivaceous brown powdery mass of spores.

Spores globose to broadly ellipsoidal, 7–10 × 6.5–8.0 µm, pale yellowish brown; wall uniformly c. 0.5 µm thick, smooth in LM, finely and sparsely verruculose in SEM.

Hosts
   
Host family: Poaceae
   
Host species: Diplachne fusca P.Beauv. ex Roem. & Schult.
Diplachne parviflora (R.Br.) Benth.

Distribution

States & Territories: NSW, NT

Comments

Ustilago serena differs from U. amplexa Syd. (on Diplachne fusca in Africa) by the paler and larger spores. The latter has medium yellowish brown spores measuring 6–7 (–7.5)
× 5.5–6.5 (–7) µm.