Puccinia mirifica
| Puccinia mirifica | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia mirifica | ||||||||||||
| Dietel & Holway |
Puccinia mirifica is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Borrichia arborescens and Borrichia frutescens . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern North America .
features
Macroscopic features
Puccinia mirifica can only be recognized with the naked eye by 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 mirifica grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow predominantly on the underside of the host leaves. The aecia of the species growing underneath the leaves are chocolate brown. Their chestnut brown aeciospores are 24–30 × 17–23 µm in size, ovate and spiky. The uredia of the fungus, which usually grow on the underside of the host leaves, are in groups. Their chestnut brown uredospores are 24–30 × 17–23 µm in size, ovate and spiky. The parts of the species growing underneath the leaves are chocolate brown, powdery and uncovered. The chestnut-brown teliospores are one- to two-celled, usually ellipsoidal, wrinkled and mostly 30–42 × 19–27 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia mirifica stretches from the southwest USA to northern Mexico and the Caribbean .
ecology
The host plants of Puccinia mirifica are Borrichia arborescens and B. frutescens . 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 .