Puccinia pseudocesatii
| Puccinia pseudocesatii | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia pseudocesatii | ||||||||||||
| Cummins |
Puccinia pseudocesatii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grasses Chrysopogon gryllus and Bothriochloa ischaemum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in southern Europe .
features
Macroscopic features
Puccinia pseudocesatii 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 pseudocesatii 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 the underside of the host leaves. Their golden to cinnamon-brown uredospores are 23–28 × 19–24 µm in size, spherical to ovoid and finely warty. The parts of the species, mostly growing underneath the leaf, are black-brown, powdery and exposed early. The chestnut-brown teliospores are two-celled, club-shaped to long ellipsoidal and 40–48 × 18–23 µm in size. Their stalk is yellow-brown and up to 80 µm long.
distribution
The known distribution area of Puccinia pseudocesatii includes southern Europe.
ecology
The host plant of Puccinia pseudocesatii is Chrysopogon gryllus and Bothriochloa ischaemum . 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 .