Puccinia ximenesiae
| Puccinia ximenesiae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia ximenesiae | ||||||||||||
| Long |
Puccinia ximenesiae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the composites Verbesina encelioides . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southwest North America .
features
Macroscopic features
Puccinia ximenesiae 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 ximenesiae grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on both sides of the host leaves. The aecia of the species are whitish and stand in groups. They have 26–34 × 18–23 µm in size, spherical to long ellipsoidal, hyaline aeciospores with a warty surface. The uredia growing on both sides of the mushroom are cinnamon brown. Their cinnamon-brown uredospores are 25–32 × 20–24 µm in size, ovate to ellipsoidal and spiky. The bilateral growing parts of the species are black-brown, powdery and uncovered. The golden to dark chestnut-brown teliospores are two-celled, usually ellipsoidal to broadly ellipsoidal and 35–46 × 26–32 µm in size. Their stem is almost colorless and up to 135 µm long.
distribution
The known distribution area of Puccinia ximenesiae extends from southern Texas and California to northern Mexico .
ecology
The host plant of Puccinia ximenesiae is Verbesina ecelioides . 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 goes through a development cycle with Spermogonia, Aecien, Telien and Uredien, but does not change host.
Taxonomy
The species was first described in 1902 by William Henry Long .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .