Restiosporium spathacei Vánky, R.G. Shivas & C. Vánky

Description

Sori in the nuts, ovoid with an acute tip, c. 1 mm long and 0.5 mm wide, replacing the seeds with a black granular-powdery mass of spore balls. The fungus induces transvestism in the host.

Spore balls globose, subglobose to ellipsoidal or slightly irregular, 30–70 × 20–50 µm, dark olivaceous brown, composed of 10–30 (or more?) readily separating spores.

Spores subglobose, ellipsoidal or somewhat irregular, with 1 or 2 slightly flattened sides, 11–16 × 8–13 µm, yellowish to olivaceous brown; wall uniformly 0.5–0.8 µm thick, smooth; free surface very finely verruculose.

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

Distribution

States & Territories: QLD

Comments

Restiosporium spathacei differs from R. dapsilanthi by having thinner spore walls (in LM), and spore walls that are smooth on the contact sides, in contrast to the finely and densely verruculose-echinulate spores of R. dapsilanthi (in SEM).