Moreaua evandrae (Websdane & Vánky) Vánky

Synonyms

Tolyposporium evandrae Websdane & Vánky

Description

Sori in the flowers, completely hidden by the floral envelopes. Infected spikelets ovoid, slightly swollen and remaining closed, the fungus deforming and destroying the inner floral organs which are covered by the initially agglutinated, later granular-powdery black mass of spore balls. Infection systemic; all spikelets of an inflorescence affected.

Spore balls subglobose, ellipsoidal to elongate or irregular, 90–160 (–210) × 80–140 (–160) µm, black, opaque, composed of many (hundreds) of firmly cohering spores that break rather than separate by pressure.

Spores in median view subcuneiform to elongate, subcylindrical, 20–40 × 5–24 µm, dark chocolate-brown; free surface irregularly polygonal, 6.5–14.0 × 5.5–12.0 µm; wall of the free surface irregularly uneven, 2.5–5.0 µm thick, with a central germ pore; wall of contact sides c. 0.5 µm, smooth. Near the centre of large spore balls part of the spore wall may be free, thickened and rough.

Hosts
   
Host family: Cyperaceae
   
Host species: Evandra aristata R.Br.

Distribution

States & Territories: WA