Bryoscyphus hyalotectus (Helotiales, Ascomycota) is presented as a new
species based on a single collection from Canada. It infects the moss
Polytrichum juniperinum. Apothecia occuby a special microniche on the
host plant. They develop between the leaf lamellae where the inflexed
leaf margins meet. The parasite is distinguished by intracellular
haustoria that arise directly from superficial hyphae without
intervention of appressoria.