Exobasidium miyabei
| Exobasidium miyabei | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium miyabei | ||||||||||||
| Nagao , Akimoto & Kishi |
Exobasidium miyabei is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It lives as an endoparasite on Rhododendron dauricum . Symptoms of the infestation by the fungus are light spots on the upper side of the leaf and the emergence of the mycelium on the underside of the leaves of the host plants. The mushroom species is common in Japan .
features
Macroscopic features
Exobasidium miyabei cannot initially be seen with the naked eye. Symptoms of the infestation are yellowish, hypotrophic spots on the upper side of the leaf and protruding mycelium on the underside.
Microscopic features
As in all naked basidia , the mycelium of Exobasidium miyabei grows intercellularly and forms suction threads that grow into the host's storage tissue. The three- to five-pore, 25–41 × 7–9 µm large basidia are long, unseptate and cylindrical to club-shaped. They grow directly from the host epidermis or from stomata . The elliptical to egg-shaped spores are hyaline , 14–23 × 4–5 µm in size. At first they are unsepted, when ripe they have one to six septa . The conidia are very variable in shape and 3–12 × 1–1.5 μm in size.
distribution
The known distribution area of Exobasidum miyabei extends from Hokkaidō to Kanagawa Prefecture .
ecology
The host plant of Exobasidium miyabei is Rhododendron dauricum . 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 they have fallen on a suitable substrate, these germinate in germ tubes, from which new mycelium and conidia develop.
swell
- H. Nagao, M. Akimoto, K. Kishi, A. Ezuka, M. Kakishima: Exobasidium dubium and E. miyabei sp. nov. causing Exobasidium leaf blisters on Rhododendron spp. in Japan . In: Mycoscience . 44, No. 1, February 1, 2003, ISSN 1340-3540 , pp. 1-9. doi : 10.1007 / s10267-002-0068-x . Retrieved October 6, 2012.