A Diverse Population of Introns in the Nuclear Ribosomal Genes of Ericoid Mycorrhizal Fungi Includes Elements with Sequence Similarity to Endonuclease-Coding Genes

A Diverse Population of Introns in the Nuclear Ribosomal Genes of Ericoid Mycorrhizal Fungi Includes Elements with Sequence Similarity to Endonuclease-Coding Genes