Restiosporium guringaliae Vánky & R.G. Shivas

Description

Sori inconspicuous,destroying the seeds and filling the capsules with a black granular-powdery mass of spore balls. Infection systemic; all capsules of a plant affected.

Spore balls globose, ovoid-ellipsoidal or slightly irregular, 50–120 (–150) × 40–100 µm, dark olivaceous brown to opaque, composed of tens to hundreds of spores that separate readily by pressure.

Spores rounded to elongate, subpolyhedrally or polyhedrally irregular, 9–14 (–16) × 7.5–10.5 µm, pale olivaceous brown with darker lines corresponding to the edges of contact sides; wall uniformly c. 0.5 µm thick; in LM smooth, in SEM the free surface of the outermost spores in a ball rough, with low irregular rounded often confluent warts.

Hosts
   
Host family: Restionaceae
   
Host species: Guringalia dimorpha (R.Br.) B.G.Briggs & L.A.S.Johnson

Distribution

States & Territories: NSW

Comments

Restiosporium guringaliae is morphologically closest to R. meneyae (on Lyginia) which has spores that appear smooth or very finely and sparsely low-verruculose under SEM.