Sporisorium melinidis (Zundel) Vánky (as 'melinis')

Synonyms

Cintractia melinis Zundel
Ustilago rhynchelytri L. Ling

Description

Sori in the spikelets destroying the flowers, leaving the glumes and often also the tips of the floral envelopes intact, inconspicuous, globose, subpyramidal, ovoid, elongate or V-shaped, c. 1–3 mm long and 1 mm wide, at first covered by a thin peridium of host and fungal origin which ruptures exposing an agglutinated blackish brown mass of spores with a powdery surface, surrounding a short stout simple or V-shaped columella, corresponding to the two destroyed flowers in the spikelet.

Spores broadly ellipsoidal, ovoid, elongate or irregular, 9–14 (–16) × 8.0–10.5 µm, yellowish brown; wall uniformly c. 0.8 µm thick, from finely and densely punctate-verruculose to finely and densely echinulate.

Sterile cells not seen between the spores.

Hosts
   
Host family: Poaceae
   
Host species: Melinis minutiflora P.Beauv.

Distribution

States & Territories: QLD

Comments

Sporisorium melinidis produces inconspicuous sori in florets of the exotic perennial grass Melinis minutiflora (molasses grass) which was introduced from Africa for erosion control and as fodder.