Stenocybe fragmenta, a new species of Mycocaliciaceae with fragmenting spores

The new species Stenocybe fragmenta (Ascomycota, Mycocaliciaceae) is described from western North America. The species was collected from twigs of Cercocarpus montanus and Rhamnus purshiana. Stenocybe fragmenta is characterized by 5-7 septate, 18-30 I?m long ascospores that fragment at maturity. This is the first report of spore fragmentation among the Mycocaliciaceae.