Puccinia versicolor
| Puccinia versicolor | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia versicolor | ||||||||||||
| Dietel & Holway |
Puccinia versicolor is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of green rose and canthium as well as numerous types of sweet grass . 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 tropics around the world.
features
Macroscopic features
Puccinia versicolor 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 versicolor grows as with all Puccinia intercellular types, and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 23-25 × 19-21 µm large aeciospores with a wrinkled surface. The yellow uredia of the species usually grow on the underside of the leaves of the host plant. Their colorless uredospores are usually broadly ellipsoidal, 25–33 × 21–28 µm in size and finely spiky. The parts of the species, mostly growing underneath the leaves, are black-brown, powdery and uncovered early. The dark golden to light hazelnut brown teliospores of the fungus are two-celled, horizontally to vertically septate, usually broad to elongated ellipsoid and 27–31 × 23–28 µm in size. Their stem is colorless and up to 130 µm long.
distribution
The well-known distribution area of Puccinia versicolor is pantropically distributed.
ecology
The host plants of Puccinia versicolor are for the haplonts convertible herb ( Lantana spp.) And Canthium species as well as a variety of sweet grasses for the dikaryote . 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 with Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .