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Puccinia saccardoi Ludwig

Description
Spermogonia on upper leaf surface, subepidermal.

Aecia on both leaf surfaces, up to 250 µm high; peridium white to pale yellow.

Aeciospores subglobose, ellipsoidal or doliiform, yellow, 12‒15 × 10‒12 µm, thin walled, finely verruculose.

Telia on fruit, stems and both leaf surfaces, subepidermal, erumpent, dome-shaped, grey to black.

Teliospores cylindrical or clavate, apex acuminate, rounded to truncate (flattened), 1, 2 or 3 celled, reddish brown, 35‒67 × 17‒35 µm; wall 1‒4 µm thick at sides, 3‒14 µm thick at apex, smooth, with persistent pedicel, 30‒50 µm.

Mesospores often found in the telia amongst the teliospores, single celled, pale yellowish brown, ellipsoidal to slightly asymmetrical, smooth, with a conical domed apex up to 9 um thick; wall 1 µm thick at sides, 23‒42 × 14‒19 µm, remanants of pedicel persistent.

Hosts
Host family: Goodeniaceae
Host species: Goodenia glauca
Scaevola spinescens

Velleia cycnopotamica

Distribution
WA

Comments
Puccinia saccardoi is one of five Australian species of rust fungi on hosts in the Goodeniaceae (McTaggart et al. 2014). These five species of rust were shown to be closely related to P. lagenophorae, which occurs on Asteraceae (Scholler et al. 2011). These rusts may all have evolved from recent, sympatric speciation after host jumps in a shared environment (McTaggart et al. 2014).