Puccinia infuscans
| Puccinia infuscans | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia infuscans | ||||||||||||
| Arthur & Holway |
Puccinia infuscans is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Bothriochloa . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in South and Central America .
features
Macroscopic features
Puccinia infuscans can only be recognized with the naked eye from 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 infuscans 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 usually grow on the underside of the host leaves. Their golden to cinnamon-brown uredospores are 25–29 × 21–24 µm in size, spherical to broadly ellipsoidal and finely spiky. The parts of the species that grow underneath the leaves are chocolate-brown, powdery and exposed early. The golden to light chestnut brown teliospores are one to two-celled, usually long ellipsoid to ellipsoid and 30–40 × 18–21 µm in size. Their stem is colorless to yellowish and up to 60 µm long.
distribution
The well-known distribution area of Puccinia infuscans includes South and Central America from Venezuela to Guatemala .
ecology
The host plants of Puccinia infuscans are different Bothriochloa species. 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 .