Moreaua caustidis (Vánky) Vánky

Synonyms

Tolyposporium caustidis Vánky

Description

Sori in the flowers, completely hidden by the floral envelopes, the black initially agglutinated, later granular-powdery mass of spore balls covering the surface of the inner aborted floral organs which are permeated by hyphae.

Spore balls broadly ellipsoidal to (usually) irregular or elongate, (25–) 30–75 (–90) × 20–65 µm, blackish brown to opaque, composed of (5–) 10–140 (or more ?) firmly cohering spores.

Spores blackish brown, in median view subcuneiform, elongate or irregular, 8–17 µm long, in surface view irregularly subpolygonal or elliptic, 8–16 µm long, yellowish to dark chocolate-brown; wall on the free surface (6–) 7–16 (–18) × (5–) 6.5–12.0 µm; free wall slightly convex, c. 1 µm thick, with irregular 0.5–1.0 µm high warts; wall of contact sides thin, c. 0.5 µm, smooth.

Hosts
   
Host family: Cyperaceae
   
Host species: Caustis blakei Kük.
Caustis flexuosa R.Br.
Caustis pentandra R.Br.

Distribution

States & Territories: NSW, QLD