Ustilago spinificis F. Ludw.

Synonyms

Cintractia spinificis (F. Ludw.) McAlpine

Description

Sori in spikelets of both male and female plants transforming the inner floral organs into an initially agglutinated, later dusty dark brown mass of spores, hidden by the outermost floral envelopes.

Spores globose, subglobose, ovoid, broadly ellipsoidal, sometimes lacrymiform or lemon-shaped with 1 or 2 subacute ends, often laterally slightly compressed, 4–5 (–5.5) × 3.0–4.5 µm, pale olivaceous brown; wall c. 0.5 µm thick, thinner on the lateral compressed sides, densely verrucose.

Spore germination (on MYP, at room temperature, after 1 day) resulting in 4-celled basidia on which ovoid to elongate-ellipsoidal basidiospores are produced laterally and terminally on sterigmata.

Hosts
   
Host family: Poaceae
   
Host species: Spinifex hirsutus Labill.
Spinifex longifolius R.Br.
Spinifex sericeus R.Br.
Zygochloa paradoxa (R.Br.) S.T.Blake

Distribution

States & Territories: NT, QLD, SA, TAS, VIC, WA