Exobasidium rhododendri-siderophylli
| Exobasidium rhododendri-siderophylli | ||||||||||||
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| Exobasidium rhododendri-siderophylli | ||||||||||||
| Li & Guo |
Exobasidium rhododendri-siderophylli is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of Rhododendron siderophyllum . Symptom of infection by the fungus is hypetrophic chlorosis on the leaves and fruits of the host plants. The species is endemic to China .
features
Macroscopic features
Exobasidium rhododendri-siderophylli is initially invisible to the naked eye. Symptoms of the infestation are hypertrophic chlorosis , characterized by swelling and light yellow discoloration of the tissue. It is an average of 2 to 3.3 cm long, 0.5-1.8 cm wide, and 2.5 mm thick. In the late stages of the infestation, mycelium appears on the surface of the plant.
Microscopic features
As in all naked basidia , the mycelium of Exobasidium rhododendri-siderophylli grows intercellularly and forms suction threads that grow into the host's storage tissue. The three to seven pore, 5–9 µm wide basidia are long, unseptate and cylindrical to club-shaped. They grow directly from the host epidermis or from stomata . The elliptical to club-shaped spores are hyaline and 13–15 × 3–4 µm in size. At first they are unsepted, when ripe they have a septum . The conidia are hyaline, bacillus-shaped and 5–7.5 × 1–2 μm in size. In addition to the macroscopic symptoms of the host plant, the short germ tubes of the spores and the 3–7 sterigmata of the basidia are characteristic of the species .
distribution
The known distribution area of Exobasidum rhododendri-siderophylli only includes the Chinese province of Yunnan .
ecology
The host plant of Exobasidium rhododendri-siderophylli is Rhododendron siderophyllum . Young leaves and fruits are particularly affected. 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 into germ tubes and conidia, from which new mycelium then develops.
swell
- Zhenying Li, Lin Guo: Studies of Exobasidium new to China: E. rhododendri-siderophylli sp. nov. and E. splendidum . In: Mycotaxon . 114, 2010, pp. 271-279.