Triodiomyces inaltilis (Vánky & A.A. Mitchell) McTaggart & R.G. Shivas

Synonyms

Ustilago inaltilis Vánky & A.A. Mitchell

Description

Sori as blister-like 1–5 mm wide swellings, several centimetres long, on the stems, by confluence often surrounding the stem, usually comprising the distal internodes extending to the floral stem on which only groups of aborted spikelets develop. Sori at first covered by the epidermis as a thin grey membrane that ruptures irregularly exposing the black dusty mass of spores.

Spores globose, subglobose to broadly ellipsoidal, often slightly irregular, rarely elongate, (5.5–) 6.0–9.5 (–10.5) × 5.5–8.0 (–9.0) µm (globose or subglobose spores 5.5–9.0 µm diam.), medium dark chocolate-brown; wall 1.0–2.0 (–2.5) µm thick, densely and prominently verrucose; spore profile minutely crenulate.

Hosts
   
Host family: Poaceae
   
Host species: Triodia longiloba Lazarides

Distribution

States & Territories: WA

Comments

The spores of T. inaltilis are smaller than those of T. altilis (7–12 × 7–11 µm), and the sori are longer and comparatively narrow. Furthermore, T. inaltilis leaves aborted spikelets on the infected shoots, whereas infection by T. altilis destroys all of the spikelets.