Puccinia investita
| Puccinia investita | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia investita | ||||||||||||
| Schweinitz |
Puccinia investita is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the genus Gnaphalium . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America.
features
Macroscopic features
Puccinia investita can only be recognized with the naked eye from 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 investita 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 underneath the leaves are whitish and stand individually or in groups. They have 20–26 × 18–22 µm in size, usually spherical and hyaline aeciospores with a spiky surface. The fungus does not develop uredia . The leaves of the species growing on the underside of the leaves and on stems are black-brown, compact and uncovered. The chestnut-brown teliospores are two-celled, usually long ovate to oblong and 40–53 × 18–23 µm in size. Their stem is colorless to yellowish and up to 60 µm long.
distribution
The known distribution area of Puccinia investita extends from South America to Ontario .
ecology
The host plants of Puccinia investita are various Gnaphalium species. 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 development cycle with spermogonia, aecia and telia, but does not change host.
Taxonomy
The species was first described in 1832 by Lewis David von Schweinitz .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .