Rust Fungi of Southeast Asia

Hamaspora acutissima P. Syd. & Syd.

Description
Telia on both leaf surfaces and stems, erumpent, linear, forming long columns, up to 1 cm, white to orange.

Teliospores clavate, apex acuminate, 4-6 celled, hyaline to subhyaline, 141-164 × 15-23 µm; wall 1.5-2.5 µm thick, 16-22 µm thick at apex, smooth; pedicel persistent, over 200 µm.

Specimens cited in description:
- BRIP 58439.

Hosts
Host family:
- Rosaceae

Host species:
- Rubus multibracteatus

Distribution
Philippines, Vietnam

Comments
Sydow and Sydow (1915) described H. acutissima on Rubus rolfei from the Philippines, and R. moluccana from Queensland, Australia. Molecular data (unpublished) indicated there was intraspecific diversity between the Australian, Philippine and Vietnamese specimens of H. acutissima. McTaggart et al. (2015) confirmed the familial placement of Hamaspora in the Phragmidiaceae.

Highslide JS
Hamaspora acutissima on Rubus multibracteatus - BRIP 58439.
Highslide JS
Hamaspora acutissima on Rubus multibracteatus - BRIP 58439.
Scale bar = 1 cm.
Highslide JS
Teliospores of Hamaspora acutissima on Rubus multibracteatus - BRIP 58439.
Scale bar = 100 µm.
Highslide JS
Hamaspora acutissima on Rubus multibracteatus - BRIP 58439.
Scale bar = 10 µm.