Tilletia challinoriae McTaggart & R.G. Shivas (as 'challinorae')

Description

Sori in some ovaries of an inflorescence, protruding past the lemma, but not longer than the glumes of a floret, ovoid, 1.5–2.5 × 1.0 mm, covered by a peridium, initially green becoming dark brown, rupturing irregularly releasing the black, powdery spore mass mixed with sterile cells.

Spores when mature, globose to subglobose,  30–35 × 28–32 µm, dark chestnut brown, opaque; wall even, 3.0–4.0 µm thick, ornamented with conical acute warts, c. 3 µm high, 3 µm wide at base, 26–31 per spore diameter, in surface view appearing as irregular subpolyangular spots.

Sterile cells globose, subglobose to broadly ellipsoidal, 15–26 x 15–23 µm, hyaline to sub-hyaline, pale yellow when larger; wall 1.5 – 7.0 µm thick, finely verruculose.

Hosts
   
Host family: Poaceae
   
Host species: Panicum trachyrhachis Benth.

Distribution

States & Territories: WA