Puccinia paradoxica
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Puccinia paradoxica is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Melica smithii . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in the north of the USA .
features
Macroscopic features
Puccinia paradoxica 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 paradoxica 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 yellow-brown to orange uredia of the fungus grow on the underside of the leaf surfaces of the host plant. Their yellow uredospores are broadly ellipsoidal to spherical, 20-25 × 17-20 µm in size and finely spiky. The parts of the species that grow underneath the leaves are cinnamon-brown, exposed early and compact. The hazel-brown teliospores are two-celled, variably shaped (usually ellipsoidal) and 30–38 × 19–23 µm in size; their stalk is hyaline and up to 25 µm long.
distribution
The known distribution area of Puccinia paradoxica includes the US state Michigan .
ecology
The host plant of Puccinia paradoxica is Melica smithii . 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 Uredien and their host are known; Spermogonia and aecia could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .