Sphacelotheca polygoni-serrulati Maire

Synonyms

Sphacelotheca doliaris Liro
Sphacelotheca polygoni-persicariae Deml & Oberw.
Sphacelotheca tropico-africana Zundel
Ustilago polygoni-serrulati (Maire) Cif.

Description

Sori in ovaries, swollen, covered by a peridium that ruptures from the apex exposing the dark violet powdery mass of spores and a central columella.

Spores globose, subglobose to sometimes slightly irregular, 10–14 (–15) × 9–13 µm, when immature catenate, later solitary, purplish brown, with disjunctors; wall thin, 0.8–1.0 µm, very finely and irregularly reticulate, in SEM interspaces smooth or with 1 to a few warts of different sizes.

Sterile cells hyaline, globose (globose cells 8–25 µm diam.), subglobose, elliptical or polygonally irregular, with a few vacuoles; wall 1–3 µm thick, smooth.

Spore germination resulting in 4-celled basidia that produce lateral basidiospores.

Hosts
   
Host family: Polygonaceae
   
Host species: Persicaria decipiens (R.Br.) K.L.Wilson

Distribution

States & Territories: NSW, SA, TAS, WA

Comments

Sphacelotheca polygoni-serrulati differs from S. hydropiperis (Schumach.) de Bary in having finely reticulate rather than minutely verruculose spores. The spore surface ornamentation in S. koordersiana (Bref.) Zundel is intermediate, and can be determined with certainty only by SEM.