Sporisorium polycarpum (Syd.) Vánky

Synonyms

Cintractia eremochloae Langdon
Sorosporium polycarpum Syd.

Description

Sori occupying the innermost floral organs of all sessile fertile spikelets, ovoid to cylindrical, inconspicuous, 2–4 mm long, 1 mm wide, partly hidden by the glumes, at first covered by a thick brown peridium of fungal and host origin which ruptures from its apex exposing the dark brown initially agglutinated, later granular-powdery mass of spore balls surrounding a simple central columella (c. the length of the sorus). Immature sori with the remnants of floral organs (anthers, stigma, and often the tips of lemma and palea) visible at their apices.

Spore balls globose, ellipsoidal, elongate or irregular, 50–150 µm long, semi-permanent, dark reddish brown to opaque, composed of many (tens to several hundred) spores.

Spores globose, subglobose to broadly ellipsoidal, usually slightly subpolyhedrally irregular, 6.5–8.0 (–9) × 5.5–7.0 µm, yellowish brown; wall uniformly c. 0.5 µm thick, smooth to finely punctate; spore profile smooth, in SEM finely and densely verrucose.

Hosts
   
Host family: Poaceae
   
Host species: Eremochloa bimaculata Hack.
Eremochloa muricata Hack.

Distribution

States & Territories: NSW, QLD