Puccinia pusilla
| Puccinia pusilla | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia pusilla | ||||||||||||
| Sydow & Sydow |
Puccinia pusilla is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the Capillipedium species. Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in Southeast Asia .
features
Macroscopic features
Puccinia pusilla can only be recognized with the naked eye by the spore beds protruding on the surface of the host. They grow in nests that appear as yellowish to brown spots and pustules on the leaf surfaces.
Microscopic features
The mycelium of Puccinia pusilla grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The cinnamon-brown uredia grow on the underside of the host's leaves. Their brownish uredospores are oval to ovate, 20–28 × 16–22 µm in size and finely spiky. The parts of the species are black-brown, exposed early and compact. The hazel-brown teliospores are two-celled, usually ellipsoidal and 29–36 × 20–25 µm in size; their stalk is hyaline to light yellow and up to 65 µm long.
distribution
The known distribution area of Puccinia pusilla extends from India to China to Sumatra and the Philippines .
ecology
The host plants of Puccinia pusilla are different species of Capillipedium . The fungus feeds on the nutrients present in the storage tissue of the plants, its spore beds later break through the leaf surface and release spores. The species apparently has a development cycle of which only Telien and Uredien are known so far; Spermogonia and aecia could not be assigned to the fungus.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .