Centrolepidosporium sclerodermum R.G. Shivas & Vánky

Description

Sori in all fruits (follicles) of an inflorescence, hidden by the 2 bracts of the condensed inflorescence, destroying the seeds and filling the follicles with spore balls. At maturity, follicles splitting longitudinally, exposing the black, at first agglutinated, later granular-powdery mass of spore balls.

Infection systemic; all follicles of an inflorescence and all inflorescences of a plant infected.

Spore balls globose, subglobose, ovoid, ellipsoidal or slightly irregular, with 1 or 2 somewhat flattened sides, 40–70 (–80) × 35–60 µm, dark reddish brown, opaque, composed of many (several tens to 100?) tightly packed spores surrounded by a cortex of sterile cells, formed within a hyaline mass of concentrically arranged sporogenous hyphae in which groups of hyphae with slightly swollen tips appear.

Spore ball initials c. 20 µm diam., increasing in size, becoming slightly yellowish, with a central mass of globose immature spores and a peripheral thin darker tangentially flattened cortical layer.

Mature spore balls larger, darkly pigmented, the surrounding hyaline mass of sporogenous hyphae gradually disappearing.

Spores rounded subpolyhedrally or polyhedrally irregular from compaction, 6–9 × 5.5–7.0 µm, pale yellowish or olivaceous brown; wall thin, c. 0.5 µm, smooth.

Cortex 3–4 µm thick, dark reddish brown, composed of firmly agglutinated tangentially flattened polygonally irregular sterile fungal cells 2–10 µm diam.; free surface irregularly crenate, in side view irregularly rough. By hard pressure the cortex ruptures and the spores become visible.

Spore germination resulting in branched hyphae from which basidiospores are formed. Basidiospores cylindrical, ellipsoidal to fusiform, 4–18 × 1.0–1.5 (–2.0) µm, producing secondary and tertiary spores in chains, on terminal and lateral sterigmata.

Hosts
   
Host family: Centrolepidaceae
   
Host species: Centrolepis exserta (R.Br.) Roem. & Schult.

Distribution

States & Territories: NT