Puccinia hysterium
| Puccinia hysterium | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia hysterium | ||||||||||||
| ( F. Strauss ) Röhl. |
Puccinia Hysterium is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Tragopogon pratensis . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It iswidespread in the Holarctic .
features
Macroscopic features
Puccinia hysterium 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 Hysterium grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow systemically and predominantly on the upper side on the surface of the host leaves. The aecia of the species growing on leaves, stems and inflorescences are cup-shaped. Their hyaline aeciospores are 23–26 × 20–24 µm in size, spherical to broadly ellipsoidal and finely warty. Uredien are not available. The parts of the species growing on both sides and on stems are chocolate brown, powdery and uncovered early. The chestnut-brown teliospores are two-celled, usually broadly ellipsoid, warty and mostly 32–40 × 24–30 µm in size. Their stem is colorless.
distribution
The well-known distribution area of Puccinia hysterium extends from southern Canada to Europe .
ecology
The host plant of Puccinia hysterium is the wild goat whiskers ( Tragopogon pratensis ). 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 .