Moreaua fimbristylidis Vánky & R.G. Shivas

Description

Sori on the 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 subglobose, ovoid, broadly ellipsoidal, usually slightly irregular, 40–100 × 30–70 µm, dark reddish brown, olivaceous brown to subopaque, composed of 20–100(?) tightly cohering spores that do not separate by pressure.

Spores irregular, in surface view subpolyangular, angular or elongate, 9–20 × 6.5–13.0 µm, in optical median view cuneiform or subtriangular, radially arranged, 6.5–20.0 (–24) µm long, reddish brown or olivaceous brown; wall on the free surface 1.5–2.5 (–3.0) µm thick, densely and prominently verrucose, often 2 or several warts confluent; wall on contact sides c. 0.5 µm thick, smooth.

Hosts
   
Host family: Cyperaceae
   
Host species: Fimbristylis dichotoma (L.) Vahl
Fimbristylis schoenoides (Retz.) Vahl

Distribution

States & Territories: NT, QLD

Moreaua fimbristylidis is similar to M. mauritiana (Syd.) Vánky [type on Fimbristylis sp. = Fimbristylis ovata (Burm.f.) Kern, fide K.Vánky, Mauritius], from which it differs by having larger spore balls and spores, as well as in the number of the spores per ball. Moreaua mauritiana has spore balls measuring 20–50 (–60) × 15–40 µm, with 2–16 spores that, in optical median view, are mainly triangular and up to 16 µm long.