Rust Fungi of Southeast Asia

Puccinia citrina P. Syd. & Syd.

Description
Aecia on both leaf surfaces and stems, white, peridium composed of verrucose diamond shaped cells.

Aeciospores cylindrical to ovoid, hyaline to subhyaline, 35-46 × 23-28 µm; wall 2-3 µm thick at sides, 7-13.5 µm thick at apex, verruculose.

Uredinia on lower leaf surface, subepidermal, erumpent, round, up to 200 µm, yellow to yellowish brown.

Urediniospores subglobose to ovoid, apex obtuse, yellowish brown, 32-46 × 27-32 µm; wall 1.5-3 µm thick at sides, 7.5-12 µm thick at apex, echinulate.

Telia lower leaf surface, subepidermal, erumpent, dome-shaped, brown to black.

Teliospores cylindrical to clavate, apex acuminate to rounded, 2-celled, rarely 3-celled, subhyaline to yellow, 37-60 × 21-26 µm; wall 2.5-5 µm thick at sides, 4-5 µm thick at apex, smooth, with persistent pedicel, inflated, 30-64 µm.

Specimens cited in description:
- BRIP 57439, 57440

Hosts
Host family:
- Smilacaceae

Host species:
- Smilax pygmaea
- Smilax verruculosa

Distribution
Philippines

Comments
Arthur and Cummins (1936) reported three species of Puccinia on Smilax from the Philippines, P. citrina, P. merrillii and P. smilacis-chinae. However, these rusts were not described from south-east Asia. We have used the name applied by Arthur and Cummins (1936), P. citrina, because the aeciospores and urediniospores match their description. The rusts on Smilax in south-east Asia may be different species to those described from Africa.

Highslide JS
Puccinia citrina on Smilax pygmaea - BRIP 57439.
Highslide JS
Puccinia citrina on Smilax verruculosa - BRIP 57440.
Highslide JS
Aeciospores of Puccinia citrina on Smilax verruculosa - BRIP 57440.
Scale bar = 10 µm.
Highslide JS
Peridial cells of Puccinia citrina on Smilax pygmaea - BRIP 57439.
Scale bar = 10 µm.
Highslide JS
Urediniospores of Puccinia citrina on Smilax verruculosa - BRIP 57440.
Scale bar = 10 µm.
Highslide JS
Teliospores of Puccinia citrina on Smilax verruculosa - BRIP 57440.
Scale bar = 10 µm.