Exobasidium splendidum on lingonberry
Exobasidium splendidum is a mushroom art family of Nacktbasidienverwandten (Exobasidiaceae) from the order Ustilaginomycotina . It is an endoparasite of Vaccinium fragile and cowberry ( Vaccinium vitis-idaea ). Symptoms of infection by the fungus are reddish pustules on the upper side of the leaves of the host plants. The kind is common in Europe and China .
Exobasidium splendidum is initially invisible to the naked eye. Symptoms of the infestation are one to two reddish, round spots on the upper side of the leaves of the host. They have a size of 3.5 to 5.5 mm. The fungus attacks the annual shoots and the infected leaves are bright red.
The mycelium of Exobasidium splendidum , like all naked basidia, grows intercellularly and forms suction threads that grow into the host's storage tissue. The two- to four-pore, 4-8 µm wide basidia are long, unseptate and cylindrical to club-shaped. They grow directly from the host epidermis or from stomata . The cylindrical or club-shaped to egg-shaped spores are hyaline and 9–14 × 3–4.2 µm in size. At first they are unsepted, when ripe they have one to three septa . The conidia are hyaline, variable in shape and 2–30 × 1–2.5 μm in size.
The host plants of Exobasidium splendidum are Vaccinium vitis-idaea and Vaccinium fragile . 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. As a monocyclic fungus (that is, it spores only once during the growing season) it overwinters in vegetative buds and then attacks the developing annual shoots in spring. The spores germinate into germ tubes and conidia, from which new mycelium then develops.
- Zhenying Li, Lin Guo: Studies of Exobasidium new to China: E. rhododendri-siderophylli sp. nov. and E. splendidum . In: Mycotaxon . tape 114 , 2010, pp. 271-279 .
- Sven Gunnar Ryman, Ingmar Holmåsen: mushrooms . Bernhard Thalacker Verlag, Braunschweig 1992, ISBN 3-87815-043-1 , p. 72.
- Tuija Pehkonen, Hanna Ranta, Anne Tolvanen. Kari Laine: The frequency of the Fungal Pathogen Exobasidium splendidium in two Natural Stands of the Host Vaccinium vitis-idaea in the Subarctici Timberline Area. In: Arctic, Antarctic, and Alpine Research . tape 34 . Instaar, the University of Colorado, 2002, pp. 428-433 , JSTOR : 1552200 .