Exobasidium unedonis
| Exobasidium unedonis | ||||||||||||
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| Exobasidium unedonis | ||||||||||||
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Unedonis Exobasidium is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of the western strawberry tree ( Arbutus unedo ). Symptoms of the infestation by the fungus are small, yellow-greenish to red-discolored leaves of the host plants. The range of the species includes the Mediterranean area.
features
Macroscopic features
Exobasidium unedonis is initially invisible to the naked eye. Symptoms of the infestation are significantly smaller, initially yellow-green and finally red discolored leaves, which are also significantly widened, and in the late stage mycelium protruding on the underside of the leaf .
Microscopic features
The mycelium of Exobasidium unedonis grows as with all exobasidium intercellular and forms Saugfäden that grow into the storage tissue of the host. The mostly four-pore basidia are unseptate. They grow directly from the host epidermis or from stomata . The short, banana-like spores are hyaline and 13–21 × 4–6 µm in size. The conidia are elongated to club-shaped and 6–10 × 2.2–2.5 µm in size.
distribution
The known distribution area of Exobasidum unedonis includes the European Mediterranean area .
ecology
The host plant of Exobasidium unedonis is the western strawberry tree ( Arbutus unedo ), probably also the eastern strawberry tree ( Arbutus andrachne ). The fungus feeds on the nutrients present in the storage tissue of the plants, its basidia later break through the leaf surface and release spores. The spores germinate into germ tubes , from which conidia and new mycelium then develop.
swell
- John Frithiof Nannfeldt: Exobasidium, a taxonomic reassessment applied to the European species . In: Symbolae Botanicae Upsalienses . tape 23 (2) , 1981, pp. 1-71 .