Ustilago schmidtiae Vánky

Description

Sori in some ovaries of an inflorescence, completely hidden by the lemma and palea, ovoid, c. 2–3.0 mm long and 1.5 mm wide, dark brown, covered by a thin membrane of the pericarp which ruptures exposing the blackish brown, at first semi-agglutinated, later powdery mass of spores.

Spores globose, subglobose, ovoid to ellipsoidal, 9–12 × 8.0–10.5 µm, medium reddish brown; wall uniformly thin (c. 0.7 µm), moderately densely and uniformly finely echinulate, giving a finely serrulate spore profile. Columella and sterile cells between the spores absent.

Hosts
   
Host family: Poaceae
   
Host species: Enneapogon polyphyllus (Domin) N.T.Burb.
Enneapogon purpurascens (R.Br.) P.Beauv

Distribution

States & Territories: NT, WA

Comments

The spores of U. schmidtiae are less obviously echinulate on Enneapogon purpurascens than on E. polyphyllus, even when found at the same location.