Puccinia calthae
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Puccinia calthae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of marigolds . 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
Puccinia calthae 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 calthae grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on both sides of the host leaves and are honey-colored. The predominantly underside of the leaves growing aecia of the species are cup-shaped and have a white peridium . Their orange aeciospores are 21–28 × 21–28 µm in size, spherical to ellipsoidal and finely warty. The uredia of the fungus, which predominantly grow on the underside of the leaves, are cinnamon-brown, extremely small and rounded. Their cinnamon-brown uredospores are spherical to ellipsoid, 22–30 × 20–25 µm in size and spiky. Growing on both leaf surfaces Telien the way are chocolate brown and powdery. The chestnut-brown teliospores are two-celled, usually long to fusiform and 30–44 × 13–22 µm in size. Their stem is colorless and up to 75 µm long.
distribution
The known distribution area of Puccinia calthae covers the entire northern hemisphere.
ecology
The host plants of Puccinia calthae are marigolds ( Caltha 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.