Puccinia abnormal
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Puccinia abnormis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of chicken millet . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America .
features
Macroscopic features
Puccinia abnormalis 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 abnormis 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 of the fungus grow on both sides of the host leaves. Its cinnamon-brown uredospores are 18–20 × 17–19 µm in size, mostly broadly ellipsoidal to ovoid and finely spiky. The parts of the species growing underneath the leaves are blackish, powdery and uncovered early. The golden teliospores are two-celled, mostly irregularly transversely septate, ellipsoidal to long ellipsoidal and 30–35 × 12–15 µm in size. Their stem is colorless and 50 µm long.
distribution
The known distribution area of Puccinia abnormalis extends from the USA to Mexico to Chile and Argentina .
ecology
The host plants of Puccinia abnormalis are Echinochloa crus-galli , E zelayenis, and E. holciformis . 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 1971, ISBN 3-540-05336-0 .