Moreaua cyathochaetae (Websdane & Vánky) Vánky

Synonyms

Tolyposporium cyathochaetae Websdane & Vánky

Description

Sori in the flowers, partly or completely hidden by the floral envelopes, the black initially agglutinated, later granular-powdery mass of spore balls covering the proximal part of aborted stamens and pistil, also filling the ovary; bristles remaining intact. Infection systemic; all spikelets of an inflorescence affected.

Spore balls globose, subglobose, ovoid, elongate or irregular, 40–120 × 40–90 µm, occasionally larger by confluence, dark reddish brown to opaque, composed of 40? to hundreds of firmly united spores that break rather than separate by pressure.

Spores in median view subcuneiform to elongate, 8–24 µm long, dark reddish brown, in surface view irregularly polygonal, 5–12 × 3.0–9.5 µm; wall of the free surface slightly convex, 2–3 µm thick, irregularly and coarsely verrucose; wall of contact sides thin, c. 0.5 µm, smooth. Each spore with a pale rounded central germ pore 2–3 µm diam. on its free wall, especially distinct in paler submature spores. A few anomalous spores may also be present, these deformed, globoid and protruding from the spore balls.

Hosts
   
Host family: Cyperaceae
   
Host species: Cyathochaeta avenacea Benth
Cyathochaeta clandestina (R.Br.) Benth.

Distribution

States & Territories: WA