Moreaua tricostulariae (Websdane & Vánky) Vánky

Synonyms

Tolyposporium tricostulariae Websdane & Vánky

Description

Sori in the flowers completely hidden by the floral envelopes. Infected spikelets slightly swollen; a black agglutinated mass of spore balls covering the filaments and proximal parts of the anthers and the ovaries; bristles remaining intact. Infection systemic; all spikelets of an inflorescence affected.

Spore balls globose, subglobose, ellipsoidal, elongate or slightly irregular, 35–70 (–90) × 30–70 µm, dark reddish brown to opaque, composed of 15–80 (or more) firmly cohering spores that break rather than separate by pressure.

Spores in median view subcuneiform to elongate, 9–25 µm long, dark reddish brown; free surface polygonally irregular, 5.5–12.0 × 4–9 µm; wall of the free surface 1.5–2.5 µm thick, irregularly verrucose, verrucae often confluent, each spore with a circular germ pore, c. 2.5 µm diam., visible especially on pale immature spores; wall of the contact sides c. 0.5 µm thick, smooth.

Hosts
   
Host family: Cyperaceae
   
Host species: Tricostularia neesii Lehm.

Distribution

States & Territories: WA