Exobasidium nobeyamense

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Exobasidium nobeyamense
Systematics
Subdivision : Ustilaginomycotina
Class : Exobasidiomycetes
Order : Naked Basidia (Exobasidiales)
Family : Nude basid relatives (Exobasidiaceae)
Genre : Naked basidia ( Exobasidium )
Type : Exobasidium nobeyamense
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.

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