Erratomyces thirumalacharii (Pavgi) M. Piepenbr. & R. Bauer


Protomycopsis thirumalacharii Pavgi


Sori forming leaf spots 3–6 mm long, 2–4 mm wide, initially pale greyish green, turning greyish brown.

Spores embedded in the host tissue, globose, ellipsoidal to irregular, with 1 or 2 flattened sides, 19–26 (–28) × 16–23 µm, lemon-yellow to pale orange-yellow; wall 2-layered, inner layer uniformly 1.0–2.5 µm thick, outer layer slightly uneven, 1.0–2.5 µm thick, minutely and sparsely to moderately densely foveolate, 6–10 foveolae per spore diameter, encased in a thin hyaline sheath.

Anamorph may be present on the adaxial side of the leaves as a thin white cover formed of short conidiophores emerging from the stomata. Ballistospores produced at the tips of conidiophores, solitary, slightly curved, hyaline, unicellular, 10–13 × 2–3 µm.

Host family: Fabaceae
Host species: Sesbania cannabina (Retz.) Poir.


States & Territories: NSW


Walker (2007) reported a hypogenous ballistosporic anamorph that was abundant in most Australian collections. He examined specimens from northern NSW and neighbouring QLD, and noted that Sesbania cannabina was the only Australian host species, although about 10 other species of Sesbania are known from northern Australia.