Exobasidium sydowianum
| Exobasidium sydowianum | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium sydowianum | ||||||||||||
| Nannfeldt |
Exobasidium sydowianum is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of the real bearberry ( Arctostaphylos uva-ursi ). Symptoms of infection by the fungus are reddish spots on the leaves of the host plants. The range of the species includes northern Europe.
features
Macroscopic features
Exobasidium sydowianum is initially invisible to the naked eye. Symptoms of the infestation are reddish spots up to 5 mm wide on the leaves of the host, as well as mycelium emerging on the underside of the leaf in the late stage .
Microscopic features
The mycelium of Exobasidium sydowianum , like all naked basidia, grows intercellularly and forms suction threads that grow into the host's storage tissue. The two- to four-pore basidia are unseptate. They grow directly from the host epidermis or from stomata . The thick, banana-like spores are hyaline and 11–17 × 3–4 µm in size. The conidia are bacillus-shaped to approximately club-shaped.
distribution
The known distribution area of Exobasidum sydowianum covers the temperate to subboreal regions of Europe from Germany to Fennoscandia .
ecology
The host plant of Exobasidium sydowianum is the real bearberry ( Arctostaphylos uva-ursi ). 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 conidia, from which new mycelium then develops.
swell
- John Frithiof Nannfeldt: Exobasidium, a taxonomic reassessment applied to the European species . In: Symbolae Botanicae Upsalienses . tape 23 (2) , 1981, pp. 1-71 .