 Protomycena is an extinct monotypic genus of <unk> fungus in the family <unk> , of order Agaricales . At present it contains the single species Protomycena electra , known from a single specimen collected in an amber mine in the <unk> Septentrional area of the Dominican Republic . The fruit body of the fungus has a convex cap that is 5 mm ( 0 @.@ 2 in ) in diameter , with distantly spaced gills on the underside . The curved stipe is smooth and cylindrical , measuring 0 @.@ 75 mm ( 0 @.@ 030 in ) thick by 10 mm ( 0 @.@ 39 in ) long , and lacks a ring . It resembles extant ( currently living ) species of the genus Mycena . Protomycena is one of only five known agaric fungus species known in the fossil record and the second to be described from Dominican amber . 
