Exobasidium pentasporium
| Exobasidium pentasporium | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium pentasporium | ||||||||||||
| Shirai |
Exobasidium pentasporium is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of rhododendrons ( Rhododendron spp.). Symptoms of infection by the witch's broom fungusand brightly discolored leaves of the host plants. The range of the species is limited to Japan .
features
Macroscopic features
Exobasidium pentasporium is initially invisible to the naked eye. Symptoms of the infestation are witch's brooms on infected sprouts and lighter colored leaves and, in the late stage, mycelium protruding on the underside of the leaf .
Microscopic features
The mycelium of Exobasidium pentasporium grows as with all exobasidium intercellular and forms Saugfäden that grow into the storage tissue of the host. The four- to six-, mostly five-pore basidia are on average 14.4 × 4 µm in size, elongated to kidney-shaped and unseptate. They grow directly from the host epidermis or from stomata . Basidiospores or conidia of the species have not yet been described.
distribution
The known distribution area of Exobasidium pentasporium only includes Japan.
ecology
The host plants of Exobasidium pentasporium are Rhododendron kaempferi , R. tschonoski and R. weirichii . 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 .