Moreaua arthrostylidis Vánky & R.G. Shivas

Description

Sori on inner floral organs (ovaries, filaments), covering them with an initially agglutinated, later granular-powdery black mass of spore balls, completely hidden by the glumes.

Spore balls globose, ovoid to slightly irregular, 25–60 × 25–50 µm, yellowish brown to dark chocolate-brown or opaque, composed of (2–) 5–25 (or more ?) firmly cohering spores that do not separate by pressure.

Spores irregular, in surface view subpolyangular, angular or elongate, 10–19 × 8–15 µm, in optical median view subcuneiform or subtriangular, 8–16 µm long, yellowish to dark chocolate-brown; wall on the free surface 2.5–5.0 µm thick, densely and prominently verrucose, often 2 or several warts fusing into short rows giving an irregular pattern to the spore surface; wall on contact sides thin, c. 0.8 µm, smooth.

Hosts
   
Host family: Cyperaceae
   
Host species: Arthrostylis aphylla R.Br.

Distribution

States & Territories: NT