Polyporus tenuiculus po·ly·po·rustenuiculus uncommon noun 1. a fungus with a whitish kidney-shaped cap and elongated pores; causes white rot in dead hardwoods SynonymsPolyporus tenuiculus Related words Broader terms polypore Parts Polyporus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.