Puccinia tenuis
| Puccinia tenuis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia tenuis | ||||||||||||
| Burrill |
Puccinia tenuis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Eupatorium rugosum . 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 tenuis can only be recognized by 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 tenuis 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 short and stand in groups. They have spherical and hyaline aeciospores with a warty surface , 15–17 × 12–16 µm in size . The fungus does not develop uredia . The bilateral growing parts of the species are black-brown, powdery and uncovered. The yellowish to golden brown teliospores are two-celled, usually narrow and variable in shape and 32–43 × 12–15 µm in size. Their stalk is almost colorless and 10–25 µm long.
distribution
The well-known distribution area of Puccinia tenuis covers the east of North America from Québec to Florida .
ecology
The host plant of Puccinia tenuis is Eupatorium rugosum . 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 1884 by Thomas Jonathan Burrill .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .