Fulvisporium restifaciens (D.E. Shaw) Vánky

Synonyms

Sorosporium restifaciens (D.E. Shaw) Thirum. & Neergaard
Tolyposporium restifaciens D.E. Shaw

Description

Sori in the distal internode(s) of stems, when mature resembling twisted teased-out ropes, 20–50 (–90) cm long, 0.5–1.0 cm wide, consisting of vascular bundles, whereas the intervascular parenchyma is destroyed and replaced by a yellowish brown (later cinnamon-brown) granular-powdery mass of spore balls.

Spore balls subglobose, broadly ellipsoidal, ovoid, often elongate or slightly irregular, (12–) 16–40 (–55) × (10–) 13–32 µm, golden yellow to pale yellowish brown, translucent, composed of (1–) 5–25 (or more?) firmly cohering spores.

Spores rounded, with flattened contact sides, or ovoid, ellipsoidal, elongate, hemiglobose to subpolyhedrally irregular, 8–14 (–16) × 6–12 (–13) µm, pale golden yellow; wall smooth, 1–2 (–3) µm thick, thinner on the contact sides, thicker at the angles. In the centre of the free surface the exospore is thin, forming a round c. 2 µm wide germ pore that protrudes slightly in rehydrated spores forming a small papilla; in dehydrated spores it is depressed. Sporogenous hyphae growing between the cells of the stem parenchyma. Later, thin-walled hyaline spore ball initials are formed between the parenchyma cells, these increasing in size, becoming thick-walled and slightly pigmented; at maturity, the epidermis ruptures releasing the spore masses.

Spore germination resulting in 4-celled basidia 5–25 (–28) × 2–3 (–4) µm. Basidiospores sessile (without sterigmata), produced laterally and terminally, ovoid or long-ellipsoidal, 4–8 × 1.5–2.0 µm.

Hosts
   
Host family: Poaceae
   
Host species: Austrostipa aristiglumis (F.Muell.) S.W.L.Jacobs & J.Everett
Austrostipa bigeniculata (Hughes) S.W.L.Jacobs & J.Everett
Austrostipa blackii (C.E.Hubb.) S.W.L.Jacobs & J.Everett
Austrostipa rudis (Spreng.) S.W.L.Jacobs & J.Everett
Austrostipa scabra subsp. falcata (Hughes) S.W.L.Jacobs & J.Everett
Austrostipa setacea (R.Br.) S.W.L.Jacobs & J.Everett
Austrostipa stuposa (Hughes) S.W.L.Jacobs & J.Everett
Austrostipa variabilis (Hughes) S.W.L.Jacobs & J.Everett

Distribution

States & Territories: ACT, NSW, QLD, TAS, VIC