Tilletia inolens McAlpine

Description

Sori in the ovaries, hidden by the floral envelopes, ovoid, c. 1 mm long and 0.5 mm wide, at first covered by the pericarp that ruptures irregularly exposing the black pulverulent odourless (inolens) mass of spores and sterile cells.

Spores globose, subglobose or broadly ellipsoidal, 36–45 × 32–40 µm, golden yellow to yellowish brown, with 3.5–6.0 µm high warts that taper to subacute or flattened tips; in surface view the warts forming a darker irregular polygonal pattern of variable size, 15–20 per spore diameter.

Sterile cells few, globose to irregular, 12–28 µm long, subhyaline to pale yellow; wall 1.5–2.5 µm thick, smooth; intermediate forms (immature spores) frequent, smaller, paler, more finely ornamented.

Hosts
   
Host family: Poaceae
   
Host species: Agrostis parviflora R.Br.
Deyeuxia quadriseta (Labill.) Benth.
Lachnagrostis filiformis (G.Forst.) Trin.

Distribution

States & Territories: SA, TAS, VIC

Comments

Tilletia inolens and T. sphaerococca both occur on Agrostis spp. in Australia. However, the spores of T. inolens are warty, unlike the reticulate spores of T. sphaerococca. Tilletia inolens and T. lachnagrostidis also infect Lachnagrostis filiformis, but T. inolens differs from T. lachnagrostidis by spore size and ornamentation. The spores of T. lachnagrostidis are 18.5–23.0 µm long, with 2.5–3.5 (–4.0) µm high subconical warts, 3–5 per spore diameter.