Ustilago comburens F. Ludw.

Synonyms

Tranzscheliella comburens (F. Ludw.) Vánky & McKenzie
Ustilago exigua Syd. & P. Syd.
Ustilago microspora Massee & Rodway

Description

Sori destroying the inflorescence (only the rachis remaining), covered by an olivaceous brown powdery mass of spores mixed with ramifying irregular fibres of host origin.

Spores globose, ovoid, ellipsoidal to slightly irregular, 2.5–4.5 (–5) × 2.5–3.5 µm, light olivaceous brown, smooth.

Spore germination resulting in 1-septate basidia c. 6 µm long.

Hosts
   
Host family: Poaceae
   
Host species: Austrodanthonia caespitosa (Gaud.) H.P.Linder
Austrodanthonia carphoides (Benth.) H.P.Linder
Austrodanthonia eriantha (Lindl.) H.P.Linder
Austrodanthonia occidentalis (Vickery) H.P.Linder
Austrodanthonia penicillata (Labill.) H.P.Linder
Austrodanthonia pilosa (R.Br.) H.P.Linder
Austrodanthonia racemosa var. racemosa (R.Br.) H.P.Linder
Austodanthonia setacea (R.Br.) H.P.Linder

Distribution

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

Comments

Ustilago comburens is one of two smuts that occur on Austrodanthonia in Australia. However, it has much smaller spores than U. agropyri.