Puccinia absicca
| Puccinia absicca | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia absicca | ||||||||||||
| HS Jackson & Holway |
Puccinia absicca is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Zexmenia frutescens . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Costa Rica .
features
Macroscopic features
Puccinia absicca 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 absicca 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 surfaces of the host leaves. The aecia of the species are unknown. The fungus lacks uredia . The bilateral growing parts of the species are cinnamon brown, powdery and uncovered. The golden-brown teliospores are two-celled, usually ellipsoidal to long-ellipsoidal, finely wrinkled and mostly 28–40 × 19–24 µm in size. Their stem is colorless and up to 85 µm long.
distribution
The known distribution area of Puccinia absicca only includes Costa Rica .
ecology
The host plant of Puccinia absicca is Zexmenia 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 microcyclic development cycle with spermogonia, aecia and telia. 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 .