Restiosporium lepidoboli (McAlpine) Vánky

Synonyms

Tolyposporidium lepidoboli (McAlpine) Thirum. & Neerg.
Tolyposporium lepidoboli McAlpine

Description

Sori in all nuts of an inflorescence, elongate, 3–7 mm long, 1.0–1.5 mm wide, hidden by the floral envelopes, filled with a black semi-agglutinated to granular-powdery mass of spore balls.

Spore balls subglobose, ovoid, ellipsoidal, elongate or irregular, 50–110 (–140) × 40–90 µm, dark reddish brown to subopaque, moderately permanent, composed of tens of spores that separate rather readily by pressure.

Spores subglobose, ovoid, ellipsoidal to usually subpolyhedrally or polyhedrally irregular, 10.5–20.0 (–24) × 9.0–13.5 (–15) µm, medium dark olivaceous brown; wall 2–4 (–5.5) µm thick, thickest at the angles, with 1 to several short subacute or acute tips at the angles, and often narrow lines connecting two tips, lines present between two contact sides with other spores. Spores finely punctate-verruculose, especially on the free surface which is also roughened by the remnants of sporogenous hyphae.

Spore germination producing 4-celled phragmobasidia in which basidial cells fuse in pairs.

Hosts
   
Host family: Restionaceae
   
Host species: Lepidobolus chaetocephalus F.Muell. ex Benth
Lepidobolus drapetocoleus F.Muell. ex Benth.
Lepidobolus pressianus Nees

Distribution

States & Territories: VIC, WA

Comments

Some collections have smaller spore balls and spores [40–90 (–120) × 30–70 (–90) µm and 10.5–18.0 (–20) × 9–13 (–14) µm, respectively] than those documented in the foregoing description which is based on the type specimen. Restiosporium lepidoboli characteristically has spores that possess a thick wall with 1 to several subacute or acute tips and narrow lines between the tips.