Uromyces geranii
| Uromyces geranii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces geranii | ||||||||||||
| ( DC. ) Lév. |
Uromyces geranii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of cranesbills . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common all over the northern hemisphere.
features
Macroscopic features
Uromyces geranii can only be recognized with the naked eye by 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 Uromyces geranii grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia of the species are orange in color. Their aecia growing on host leaves and stems are initially hemispherical-wart-shaped, later bowl-shaped. The aeciospores are usually ovate to ellipsoidal and polyhedral, orange and 21–31 × 17–22 µm in size. The uredia of the fungus growing underneath the leaves are light brown. Their light brown uredospores are broadly ellipsoidal to broadly ovate, 21–33 × 19–25 µm in size and spiky. The mostly underside of the leaf growing parts of the species are in groups on yellow or red leaf spots. The light brown teliospores are two-celled, usually ellipsoidal to spherical, spiny and 15–40 × 15–33 µm in size. Their stem is colorless and short.
distribution
The known distribution area of Uromyces geranii includes the temperate northern hemisphere and coincides with that of its host genus.
ecology
The host plants of Uromyces geranii are various cranesbills ( Geranium spp.). 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 has a development cycle with Aecien, Spermogonia, Telien and Uredien and does not change host.
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape 12 . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.