Puccinia limnodeae
| Puccinia limnodeae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia limnodeae | ||||||||||||
| Cummins |
Puccinia limnodeae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Limnodea arkansa . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Texas .
features
Macroscopic features
Puccinia limnodeae 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 limnodeae 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 yellow-brown uredia of the fungus grow on the upper side of the host leaves. Its yellow-brown to almost hyaline uredospores are 20–24 × 16–20 µm in size, mostly broad ellipsoidal to ovoid and finely spiky. The parts of the species growing underneath the leaves are black-brown and long covered. The golden to light hazelnut brown teliospores are two-celled, usually oblong to long ellipsoid and 33–42 × 17–23 µm in size. Its stem is golden brown and short.
distribution
The known distribution area of Puccinia limnodeae only includes Texas .
ecology
The host plant of Puccinia limnodeae is Limnodea arkansa . 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 .