Phaeonectriella alba sp. nov. from the River Nile, Egypt

A new species, Phaeonectriella alba, collected from the River Nile, Aswan Governorate, Egypt, is described and illustrated. Phylogenetic analyses of LSU rDNA sequences placed the new species with P. lignicola (the type species) in a highly supported clade. Phaeonectriella alba is characterized by conical, superficial, hyaline, membranous ascomata; 4- or 8-spored asci that are persistent, clavate, with a truncate apical thickening and a simple pore and cytoplasmic retraction below apex; early deliquescing catenophyses; and ascospores that are ellipsoid to broad ellipsoid, thin-walled, 1–3 septate, hyaline when young, becoming brown at maturity, with an apical germ pore in each cell and without appendages.