Restiosporium desmocladi Vánky (as "desmocladii")

Description

Sori in all nuts of an inflorescence, elongate, protruding beyond the floral envelopes, cylindrical, slightly bent, 3–6 mm long, 0.5–0.8 mm wide, with acute tips, filled with a black granular-powdery mass of spore balls. The fungus induces transvestism in the host.

Spore balls globose, ovoid, elongate or irregular, 40–130 (–140) × 40–80 µm, yellowish to reddish or dark olivaceous brown, permanent, composed of tens to 100 spores that separate into groups by strong pressure.

Spores subpolyhedrally or polyhedrally irregular, with 1 or several flattened sides, 9–16 (–19) × 8–11 (–12.5) µm, pale olivaceous brown; wall uneven, 1–3 (–4) µm thick, thickest at the angles, often with short acute tips at the angles and narrow lines on the surface; contact sides smooth; free surface with low irregular warts and remnants of the sporogenous hyphae.

Hosts
   
Host family: Restionaceae
   
Host species: Desmocladus biformis B.G.Briggs & L.A.S.Johnson
Desmocladus elongatus B.G.Briggs & L.A.S.Johnson
Desmocladus flexuosus (R.Br.) B.G.Briggs & L.A.S.Johnson
Desmocladus lateriticus B.G.Briggs & L.A.S.Johnson

Distribution

States & Territories: WA

Comments

The spore balls from Desmocladus biformis and D. flexuosus are smaller than those of the type specimen.