Common cranberry nude basidia

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Common cranberry nude basidia
Leaf galls caused by the common lingonberry naked basid (Exobasidium vaccinii)

Leaf galls caused by the common lingonberry naked basid ( Exobasidium vaccinii )

Subdivision : Ustilaginomycotina
Class : Exobasidiomycetes
Order : Naked Basidia (Exobasidiales)
Family : Nude basid relatives (Exobasidiaceae)
Genre : Naked basidia ( Exobasidium )
Type : Common cranberry nude basidia
Scientific name
Exobasidium vaccinii
( Fuckel ) Voronin

The common lingonberry naked basidia ( Exobasidium vaccinii ) is a smut fungus species from the family of naked basidia relatives (Exobasidiaceae). It lives as an endoparasite on cranberries ( Vaccinium vitis-idaea ) and infects their leaves. Symptoms of infestation by the common lingonberry naked basid are bright red leaves and heavily thickened, mycelium-coated galls on the underside of the leaves. The species is proven in the entire distribution area of ​​the lingonberry.


Macroscopic features

The common lingonberry naked basid is initially invisible to the naked eye. The initial symptoms of the infestation appear in the form of bright red, yellowish-edged spots on the upper side of the leaf. Later, about 1 cm wide, strongly thickened pink galls form on the underside of the leaf, on the surface of which the white mycelium breaks through. From there, it eventually overgrows the entire leaf.

Microscopic features

The mycelium of Common Cranberry Naked Basid grows intercellularly and forms suction threads that grow into the host's storage tissue. The four-sported basidia are 40–50 × 4–5 µm in size, unseptate and narrow-lobed. They are formed either individually or in clusters between the cells of the plant epidermis. The cylindrical spores are hyaline , thin-walled and measure 11–20 × 2–4 µm. At maturity they are septate from one to six.


The common lingonberry naked basid is widespread in the Holarctic , it is linked to the occurrence of the lingonberry ( Vaccinium vitis-idaea ).


The sole host of the common lingonberry naked basid is the lingonberry. The fungus feeds on the nutrients present in the storage tissue of the plants; initially limited to the leaves, then finally to the entire plant. The transmission from one plant to the next occurs through flight of spores. The spores germinate in 8–11 × 1 µm conidia , from which a new mycelium then develops.