Sporisorium chudeaui (Hariot & Pat.) Vánky

Synonyms

Sphacelotheca chudeaui Hariot & Pat. (as "chudaei")

Description

Sori transforming the racemes into irregular elongate bodies 5–25 mm long and 1–2 mm wide, at first covered by a thick brown peridium that ruptures irregularly and flakes away exposing the dark brown powdery mass of spores mixed with sterile cells; on the inflorescence axis only whorls of twisted columellae remain, corresponding to the destroyed raceme axes.

Spores balls large, readily disintegrating.

Spores solitary at maturity subglobose, ellipsoidal to slightly irregularly subpolyhedral, 5.5–8.0 (–9.5) × 5–7 µm, yellowish brown; wall uniformly c. 0.8 µm thick, from apparently smooth to finely and densely or moderately densely punctate-verruculose; spore profile smooth.

Sterile cells in irregular groups or chains, collapsed in old specimens; individual cells larger than the spores, 7–16 µm long, pale yellow; wall thin, c. 0.5 µm, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Chrysopogon elongatus (R.Br.) Benth

Distribution

States & Territories: NT

Comments

Sporisorium chudeaui is known from a single Australian collection. There are some minor differences between the Australian and African specimens, for example, the sterile cells are more variable in size in the former.