Puccinia asprellae-japonicae
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| Puccinia asprellae-japonicae | ||||||||||||
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Puccinia asprellae-japonicae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Hystrix japonicae . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Japan .
features
Macroscopic features
Puccinia asprellae-japonicae can only be recognized with the naked eye by means of 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 asprellae-japonicae 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 same applies to the uredia of the fungus. Its yellowish uredospores are spherical to broadly ellipsoidal, 18–20 × 16–18 µm in size and finely spiky. The parts of the species growing on the top of the leaves are cinnamon to chocolate brown, compact and uncovered early. The golden to light hazelnut-brown teliospores are two-celled, wedge-shaped to spindle-shaped ellipsoid and 48–60 × 24–30 µm in size. At the top they have a tip or finger-like extensions. Their stalk is yellowish and up to 150 µm long.
distribution
The known distribution area of Puccinia asprellae-japonicae only includes Japan .
ecology
The host plant of Puccinia asprellae-japonicae is Hystrix japonica . 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 has a development cycle of which only Telien and their host are known; Uredien, Spermogonia and Aecien could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .