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


Ustilago inaltilis Vánky & A.A. Mitchell


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.

Host family: Poaceae
Host species: Triodia longiloba Lazarides


States & Territories: WA


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.