Thecaphora leptideum (Syd.) Zundel

Synonyms

Glomosporium leptideum (Syd.) Kochman
Tolyposporium leptideum Syd.

Description

Sori in all slightly swollen ovaries of a plant, filled with a granular-dusty cinnamon-brown mass of spore balls covered by the outermost floral envelopes. Infection systemic; the infected host may be dwarfed, with small leaves and dense shoots resembling witches’ brooms, sometimes with a few shoots escaping infection.

Spore balls globose, subglobose, ovoid, occasionally elongate, 40–60 (–90) × (35–) 40–55 µm, pale cinnamon-brown, persistent, composed of numerous (tens or hundreds?) firmly united spores.

Spores irregularly subangular on their free surface, 9.5–14.5 × (6–) 7.0–11.5 µm, wedge-shaped in optical median view, radially 9.5–19.0 µm long; spore wall c. 1 µm thick, smooth on the contact surfaces, verruculose on the free surface, with irregular 0.5–1.0 µm high rounded warts.

Spore germination resulting in a short holobasidium with 3 or 4 terminal ovoid slightly bent basidiospores measuring c. 12.5 × 4.5 µm.

Hosts
   
Host family: Chenopodiaceae
   
Host species: Chenopodium ambrosioides L.
Chenopodium carinatum R.Br.

Distribution

States & Territories: NSW