Anthracocystis whiteochloae (Vánky & McKenzie) McTaggart & R.G. Shivas

Synonyms

Sporisorium whiteochloae Vánky & McKenzie

Description

Sori in the spikelets and at the internodes. Spikelet sori ovoid, cylindrical, usually with an acute tip, often slightly curved, 1.5–4.0 mm long, 1.0–1.5 mm wide, comprising all floral organs and leaving only the first, sometimes also the second glume intact, covered by a thick pale yellowish brown peridium that ruptures irregularly exposing the black, initially agglutinated, later granular-powdery mass of spore balls, and a simple central columella the same length as the sorus, comprising part or all of a lateral branch of the panicle. Internode sori forming witches’ broom, consisting of a convoluted proliferation of vegetative tissue and a thick pale yellowish brown peridium that fuses near the internode, becoming very hard and flattened.

Spore balls ovoid, elongate or slightly irregular, rarely subglobose, 40–130 × 25–70 µm, reddish brown, composed of very many spores that separate by pressure.

Spores subpolyhedrally irregular, rounded to slightly elongate, 9–12 × 8–11 µm, pale yellowish to medium reddish brown; wall of outer spores c. 0.8 µm thick, finely and densely punctate-verruculose; inner spores apparently smooth, paler, with c. 0.5 µm thick wall.

Sterile cells not seen.

Spore germination resulting in 4-celled basidia (30–50 × 2.5–3.0 µm) on which long-ellipsoidal to subfusiform basidiospores are produced laterally and terminally on sterigmata. Basidiospores 3–10 × 1.0–1.5 (–2.0) µm, budding successively and giving giving rise to yeast colonies.

Hosts
   
Host family: Poaceae
   
Host species: Whiteochloa capillipes (Benth.) Lazarides
Whiteochloa cymbiformis (Hughes) B.K.Simon
Whiteochloa semitonsa (F.Muell. ex Benth.) C.E.Hubb.

Distribution

States & Territories: NT, WA