Genus of fungi
Amphistereum is a genus of fungi in the family Auriculariaceae. Species produce cupulate to effused, leathery basidiocarps (fruit bodies) on wood. Microscopically, fruit bodies have a dimitic hyphal system. The genus is currently only known from North and South America. 
Taxonomy.
The genus was created as a result of molecular research, based on cladistic analysis of DNA sequences, which showed that two species previously referred to the genus "Eichleriella" formed a related, but distinct grouping. 
References.
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