Anthracocystis sehimatis (M.S. Patil) McTaggart & R.G. Shivas

Synonyms

Sorosporium sehimae M.S. Patil
Sporisorium sehimae (M.S. Patil) Vánky

Description

Sori in some of the sessile hermaphrodite spikelets of an inflorescence, leaving the glumes, the awned lemma and the pedicellate spikelets intact, rarely in all spikelets or destroying the entire inflorescence, cylindrical, 5–10 mm long, 1.0–2.5 mm wide, covered by a thick yellowish brown peridium that ruptures from its apex exposing the blackish brown granular-powdery mass of spore balls and 5–7 filiform columellae.

Spore balls subglobose, ellipsoidal, usually elongate or irregular, 50–160 (–200) × 40–140 µm, dark reddish brown to opaque, composed of many (tens to hundreds) spores that scarcely separate by pressure.

Spores subglobose, ellipsoidal or usually subpolyhedrally irregular, 7.0–10.5 (–11) × 6.5–9.5 µm, yellowish to pale reddish brown; wall thin (0.5–0.8 µm), apparently smooth to very finely punctate, especially the outer spores in the balls which are also somewhat darker than the inner thin-walled spores.

Hosts
   
Host family: Poaceae
   
Host species: Sehima nervosum (Rottler) Stapf

Distribution

States & Territories: NT, WA

Comments

Anthracocystis sehimatis is one of three species on Sehima nervosum in Australia. It is characterised by the fact that it infects only some of the sessile spikelets in an inflorescence and by having 5-7 filiform columellae in the sori.