Anthracocystis anthracoideispora (Vánky & R.G. Shivas) McTaggart & R.G. Shivas

Synonyms

Sporisorium anthracoideisporum Vánky & R.G. Shivas

Description

Sori in both florets of some or all spikelets of an inflorescence, cylindrical, 2–6 mm long, 0.5–1.5 mm wide, sometimes slightly curved, at first covered by a thin silvery to grey peridium that splits longitudinally at several places, on the side and from the apex of the sori, exposing the blackish brown powdery mass of spore balls, spores and 1 or 3 filiform or band-like central columellae c. the length of the sori, composed of host tissues permeated by hyphae.

Spore balls rounded to elongate or irregular, composed of few to many spores, 20–100 µm long, dark reddish brown, opaque, readily disintegrating into single spores.

Spores subpolyhedral, elongate, irregular, rarely subapiculate or spherical, (9.5–) 11–22 (–25) × (8–) 9–13 (–16) µm, dark reddish brown; wall irregularly thickened, 0.5–1.5 µm, at the angles up to 2.5 µm thick, in LM smooth or very finely punctate, in SEM finely, variably densely verruculose.

Spore germination resulting in 4–8-celled basidia 50–90 × 2.5–3.0 µm. Basidiospores ovoid to long-ellipsoidal, 3–15 × 1–2 µm, produced on sterigmata laterally and terminally on basidia; hyphae on the basidia rarely branched, c. 2.5 µm wide. In culture, basidiospores giving rise to yeast colonies of cells similar to the basidiospores.

Sterile cells of the peridium in chains; individual cells subcylindrical, rounded or slightly irregular, 5–10 µm diam., hyaline; wall uniformly c. 0.5 µm thick, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Pseudoraphis spinescens (R.Br.) Vickery

Distribution

States & Territories: QLD

Comments

While the spores of the Australian specimen are smaller than those of the type, measuring (9.5–) 10.5–16 (–20) × 8–12 (–13) µm, they are ±identical in other characteristics.