Puccinia altissimorum
| Puccinia altissimorum | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia altissimorum | ||||||||||||
| Savile |
Puccinia altissimorum is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of thistle . 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 altissimorum 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 altissimorum grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are so far unknown. The uredia of the fungus growing on the underside of the surface of the host leaves are cinnamon brown. Their light cinnamon-brown to golden uredospores are 21–25 × 20–23 µm in size, almost spherical and spiky. The parts of the species growing underneath the leaf are black-brown, powdery and uncovered. The golden to clear maroon teliospores are two-celled, usually ellipsoidal, spiky and mostly 28–38 × 18–22 µm in size. Their stem is colorless and up to 70 µm long.
distribution
The known distribution area of Puccinia altissimorum includes the USA east of the Mississippi River .
ecology
The host plants of Puccinia altissimorum are the scrub thistles Cirsium altissimum , C. iowense and C. discolor . 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 .