Puccinia scleropogonis
| Puccinia scleropogonis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia scleropogonis | ||||||||||||
| Cummins |
Puccinia scleropogonis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the nightshade family Chamaesachara sordida and the sweet grass Scleropogon brevifolius . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern North America .
features
Macroscopic features
Puccinia scleropogonis 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 scleropogonis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the fungus have 17–21 × 15–18 µm large, hyaline to yellowish aeciospores with a wrinkled surface. The yellow uredia of the species mostly grow on the top of the leaves of the host plant. Their colorless uredospores are usually ovate to broadly ellipsoidal, 16–19 × 13–15 µm in size and finely spiky. The parts of the species growing on both sides or mainly on the upper side of the leaves are black-brown, powdery and uncovered early on. The hazelnut-brown teliospores of the fungus are two-celled, usually ellipsoid and 28–35 × 17–20 µm in size. The stem is colorless to yellowish and up to 100 µm long.
distribution
The known distribution area of Puccinia scleropogonis covers North America from central Mexico to the southern USA .
ecology
The host plants of Puccinia scleropogonis are for the haplont Chamaesachara sordida and Scleropogon brevifolius 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 .