Exobasidium nobeyamense
Exobasidium nobeyamense | ||||||||||||
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Exobasidium nobeyamense | ||||||||||||
Li & Guo |
Exobasidium nobeyamense is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of Rhododendron wadanum . Symptoms of the infestation by the fungus are witches' brooms on the branches of the host plant. The range of the species is in Japan .
features
Macroscopic features
Exobasidium nobeyamense is initially invisible to the naked eye. Symptoms of the infestation are witches' brooms, i.e. strongly overgrown twigs that grow from a trunk with a thickened base and can cover an area of 40 × 50 cm. At a later stage of the infestation, white carpets of mycelium break out from the underside of young leaves.
Microscopic features
As with all naked basidia , the mycelium of Exobasidium nobeyamense grows intercellularly and forms suction threads that grow into the host's storage tissue. The fungus has a monomitic hypha structure made up of purely generative hyphae without buckles . The three- to six-pore, 35–40 × 7–10 µm large basidia are cylindrical to club-shaped and simply septate at the base. They grow directly from the host epidermis . The spores are hyaline , ovate to ellipsoid, thin-walled and 12–21 × 4–5.5 µm in size. When ripe they have two to four septa . The conidia are long and narrow, measuring 6–17 × 0.5 μm. The germ tubes of the species are 3–5 × 2–3 µm in size.
distribution
The known distribution area of Exobasidum nobeyamense includes the Japanese prefectures Nagano and Ibaraki .
ecology
The host plant of Exobasidium nobeyamense is Rhododendron wadanum . 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. After falling on a suitable substrate, these germinate into germ tubes from which new mycelium with conidia develops.
swell
- Hideyuki Nagao, Akinori Ezuka, Hiroto Ohkubo, Makoto Kakishima: A new species of Exobasidium causing witches' broom on Rhododendron wadanum . In: Mycoscience . 42, No. 6, December 2001, ISSN 1340-3540 , pp. 549-554. doi : 10.1007 / BF02460953 . Retrieved October 5, 2012.