Puccinia longipes
| Puccinia longipes | ||||||||||||
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| Puccinia longipes | ||||||||||||
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Puccinia longipes is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the genus Vernonia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in eastern North America .
features
Macroscopic features
Puccinia longipes 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 longipes grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on the upper side of the host leaves. The aecia of the species growing on both sides or mainly underneath the leaves are cinnamon-brown. Their cinnamon to golden brown aeciospores are 27–32 × 24–28 µm in size, ovate to broadly ellipsoidal and spiky. The uredia of the fungus, which grow on both sides, are light yellow-brown. Their golden to cinnamon-brown uredospores are 27–32 × 24–28 µm in size, ovate to broadly ellipsoidal and spiky. The leaves of the species growing on the underside of the leaves and on stems are black-brown and uncovered. The clear maroon teliospores are two-celled, usually ovoid to long ellipsoid, wrinkled and usually 40–52 × 22–28 µm in size. Their stem is colorless and up to 160 µm long.
distribution
The known distribution area of Puccinia longipes includes the USA east of the Mississippi River .
ecology
The host plants of Puccinia longipes are various sham asters ( Vernonia spp.). 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 macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As an auto-ecologic parasite, it does not change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .