about this key identify a rust fungus browse rust fungi host index records & references  

Hemileia wrightiae (Racib.) Racib.

Description
Uredinia on lower leaf surfaces, emerging through the stomata as short columnar fascicles up to 200 µm diam., appearing as a light powdery orange to yellowish brown sheen on the leaf surface.

Urediniospores reniform or strongly asymmetrical, with a concave or flat smooth side and a coarsely verrucose convex dorsal side, subhyaline, 22‒35 × 13‒19 µm, single on short pedicels; wall 1‒2 µm thick, with domed warts up to 3 µm long and 2 µm wide at the base.

Telia form amongst uredinia from columnar fascicles similar to the those in the uredinia; peridium and paraphyses present.

Teliospores irregular, subglobose, pyriform or campanulate, subhyaline, 21‒38 × 13‒21 µm, single on short pedicels; wall 1‒3 µm thick, smooth.

Hosts
Host family: Apocynaceae
Host species: Wrightia pubescens
Wrightia saligna

Distribution
NT, QLD

Comments
Hemileia wrightiae was described from Indonesia and is reported in India, Philippines, Taiwan and Sri Lanka (Ritschel 2005).

Highslide JS
Hemileia wrightiae on Wrightia pubescens - BRIP 54222.
Highslide JS
Hemileia wrightiae on Wrightia saligna - BRIP 54222.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Hemileia wrightiae on Wrightia saligna - BRIP 51425.
Scale bar = 10 µm.
Highslide JS
Teliospores of Hemileia wrightiae on Wrightia saligna - BRIP 51425.
Scale bar = 10 µm.