Puccinia egressa
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Puccinia egressa is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Archibaccharis oaxacanum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia egressa 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 egressa grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow predominantly on the underside of the leaf veins of the host leaves. The aecia of the species growing on the underside of the leaves and on the stems are yellowish and evoke witches' brooms . Their hyaline aeciospores are 22–28 × 18–22 µm in size, spherical to broadly ellipsoidal and warty. The uredia of the mushroom have not yet been described. Their cinnamon-brown uredospores are 23–27 × 23–27 µm in size and spiky. The parts of the species that grow on the top of the leaves are cinnamon-brown, compact and uncovered. The golden to light chestnut brown teliospores are two-celled, usually broadly ellipsoidal, wrinkled and mostly 38–45 × 21–26 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia egressa only includes the Monte Oaxaca .
ecology
The host plant of Puccinia egressa is Archibaccharis oaxacanum . 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 macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As an auto-ecologic parasite, it does not change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .