Ganoderma boninense

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Ganoderma boninense basidiocarps (click on image to enlarge it)
Author: Lanzz
Source: Mushroom Observer

Ganoderma boninense Pat. (1889)

The fungus causes basal stem rot in oil palms and is found in south-eastern Asia. The disease leads to a collapse of the lower fronds which hang down on the stem. The younger fronds turn yellowish and become curved. Sometimes only one side of the crown is affected. In severe cases, death of the palm follows. Yield losses might range from 10-45%.

The basidiocarps are brownish in color, with concentric markings. The edge is white when fresh, and the undersurface is also white.