Tilletia lineata R.G. Shivas & Vánky

Description

Sori in some of the ovaries of an inflorescence, rather conspicuous, obovoid with a rounded or shortly pointed tip and a longer narrow pedicel, 3–5 mm long, (1.0–) 1.5–2.5 mm wide, laterally compressed (c. 1 mm wide), covered by the pericarp, initially green, later brown with a grey longitudinal stripe on each side. At maturity the sori split along one of the stripes or from their apex, exposing the black pulverulent mass of spores and sterile cells.

Spores globose or subglobose, broadly ellipsoidal, ovoid or slightly irregular, 20–27 (–30) × 19–24 (–27) µm, pale to dark chocolate-brown; wall 3–4 µm thick, including the thin (c. 0.6 µm) uniform endospore and the exospore with 1.5–2.5 µm high warts that, in surface view, appear as darker irregular areas, 6–11 per spore diameter; under SEM the warts are discrete, or 2 or 3 coalesce without forming rows.

Sterile cells usually larger than the spores, subglobose, ovoid to slightly irregular, 20–40 µm long, subhyaline to pale yellowish brown; wall 1.5–6.0 (–8.0) µm thick, often multilayered, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Arundinella nepalensis Trin.

Distribution

States & Territories: WA

Comments

Four species of Tilletia are known to infect Arundinella (Vánky, 2007). Two species, T. lineata and T. shivasii are endemic to Australia. The two exotic species are T. arundinellae L.Ling (type on A. anomala Steud., China) and T. chiangmaiensis R.G.Shivas, Vánky & Athipunyakom (type on A. bengalensis (Spreng.) Druce, Thailand). Tilletia lineata has smaller spores and lower warts than T. shivasii.