Usnea is a Funeral Doom band from Portland US, they also manage to fuse some Black Metal and Sludge Metal elements into the typical Funeral Doom Sound. They Have recently (23 January) released their new self titled album wich i believe is also their debut album.
The album is pretty diverse in sound, with plodding drums and melancholic interlacing doom riffs serving as the main flow throughout the entire album, often interrupted by blasts of Black Metal or sudden surges of Sludgy mayhem. In my experience these digressions only serve the purpose of making the album more dynamic and showing the audience that their influence is broader then only Funeral doom bands like Mournful Congregation or Evoken.
They have apparently shared the stage with prevalent doom bands like Yob and Bell Witch and i think they will continue to do so in the future.