Rust Fungi of Southeast Asia

Gymnosporangium paraphysatum Vienn.-Bourg.

Description
Uredinia on both leaf surfaces, subepidermal, erumpent, round, 200-800 µm, yellowish brown; paraphyses intrasoral, clavate with filamentous pedicel 20-160 µm long, golden brown, hyaline at base, 38-61 × 17-22 µm, unthickened.

Urediniospores ellipsoidal to ovoid, apex acute, hyaline, yellow when fresh, 24-30 × 14-17 µm; wall 1.5-2 µm thick at sides, apex 3.5-6.5 µm thick, finely echinulate, with four scattered germ pores up to 5 µm diameter.

Telia on both leaf surfaces, subepidermal, erumpent, confluent.

Teliospores ellipsoidal to oval, apex rounded to papillate, mostly 2-celled, but 1-4 celled also, yellowish brown, 30-53 × 16-23 µm; wall 1.5-2 µm thick, smooth, with persisten pedicel, 50-150 µm long.

Specimens cited in description:
- BRIP 58423

Hosts
Host family:
- Cupressaceae

Host species:
- Calocedrus macrolepis

Distribution
Vietnam

Comments
Gymnosporangium paraphysatum was first described from Vietnam on Calocedrus macrolepis (as Heyderia macrolepidis) by Veinnot-Bourgin (1960). Telia and teliospore description cited from Viennot-Bourgin (1960).

Highslide JS
Gymnosporangium paraphysatum on Calocedrus macrolepis - BRIP 58423.
Highslide JS
Gymnosporangium paraphysatum on Calocedrus macrolepis - BRIP 58423.
Scale bar = 1 cm.
Highslide JS
Paraphyses of Gymnosporangium paraphysatum on Calocedrus macrolepis - BRIP 58423.
Scale bar = 10 µm.
Highslide JS
Urediniospores and paraphyses of Gymnosporangium paraphysatum on Calocedrus macrolepis - BRIP 58423.
Scale bar = 10 µm.