Puccinia sierrensis
| Puccinia sierrensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia sierrensis | ||||||||||||
| Cummins |
Puccinia sierrensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Muhlenbergia speciosa . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia sierrensis can only be recognized with the naked eye by means of the spore beds emerging 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 sierrensis 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 uredia of the fungus mostly grow on the underside of the host leaves. Their hyaline uredospores are 22–27 × 19–22 µm in size, broadly ellipsoidal to broadly ovate and finely spiky. The parts of the species growing underneath the leaves are black-brown, powdery and exposed early. The golden to light hazel-brown teliospores are two-celled, often vertically septate, broadly ellipsoidal and 29–35 × 23–26 µm in size. Their stalk is brownish to colorless and up to 125 µm long.
distribution
The known distribution area of Puccinia sierrensis only includes Mexico .
ecology
The host plant of Puccinia sierrensis is Muhlenbergia speciosa . 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 .