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Uromyces bidenticola J. Schröt.

Description
Uredinia on leaves, amphigenous, mostly abaxial, subepidermal, scattered, often in small groups forming a circle around a central sorus, erumpent, round, up to 0.5 mm, reddish brown to brown.

Urediniospores subglobose, ellipsoidal or obovoid, yellowish brown, 18‒38 × 21‒26 µm; wall 1.5‒3.0 µm thick, sparsely echinulate with conical spines up to 2.5 µm and bald patches up to 13 µm diam., with 2 equatorial germ pores.

Further details
Telia form in the uredinia, brown, becoming yellow with basidia.

Teliospores ellipsoidal or elongately obovoid, 27‒40 × 16‒20 µm, pale yellowish brown; wall 1 µm at sides, 4‒9 µm at apex including a hyaline umbo; pedicels hyaline, up to 50 µm, 5‒9 µm at base of spore, portion remains attached to spore; germ pore apical, central.

Basidia cylindrical, ca 75 × 10 µm.

Basisiospores globose to ellipsoidal, 14‒16 × 8‒12 µm, hyhaline.

Hosts
Host family: Asteraceae
Host species: Bidens pilosa

Distribution
NSW, QLD

Highslide JS
Uromyces bidenticola on Bidens pilosa - BRIP 52217.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Uromyces bidenticola on Bidens pilosa - BRIP 53658.
Scale bar = 10 µm.
Highslide JS
Teliospores of Uromyces bidenticola on Bidens pilosa - BRIP 52217.
Scale bar = 10 µm.
Highslide JS
Basidiospores of Uromyces bidenticola on Bidens pilosa - BRIP 52217.
Scale bar = 10 µm.