Puccinia holwayula
| Puccinia holwayula | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia holwayula | ||||||||||||
| Jackson |
Puccinia holwayula is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Oyedaea verbesinoides . 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 holwayula 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 holwayula 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, which grow predominantly on the upper side of the leaves, are short-cylindrical and light brown to whitish. They have 25–32 × 21–27 µm in size, spherical to broad ellipsoidal and brownish aeciospores with a warty surface. The cinnamon-brown uredia of the fungus grow on the underside of the leaf. Their yellow-brown uredospores are 23–26 × 26–29 µm in size, mostly depressed, spherical and spiky. The parts of the species that grow underneath the leaves are chestnut brown, compact and uncovered. The light golden-brown teliospores are unicellular, usually cylindrical to club-cylindrical and 60–95 × 19–26 µm in size. Their stem is colorless and up to 60 µm long.
distribution
The known distribution area of Puccinia holwayula only includes Costa Rica .
ecology
The host plant of Puccinia holwayula is the Heliantheaenart Oyedaea verbesinoides . 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, Aecien, Telien and Uredien.
literature
- George Baker Cummins : The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .