Nidularia fascicularis juglandis.melanosperma. pulvinata.rugisperma. stercorea.    From Wordnik.com.  [Transactions of the American Philosophical Society] Reference

Cup (Cyathus), the Bird’s-nest proper (Nidularia.).    From Wordnik.com.  [Among the Mushrooms A Guide For Beginners] Reference

Outside covering opening with a torn mouth, Nidularia, bird’s-nest.    From Wordnik.com.  [Among the Mushrooms A Guide For Beginners] Reference