A pleurastrophycean (PLOOR-ahs-tro-FIE-see-in) such as Trebouxia, Pseudotrebouxia, or Myrmecia is often the phycobiont, although it can also be a cyanobacterium like Nostoc or Scytonema. The mycobiont is either an ascomycete or a basidiomycete. The apothecarium is the characteristically visible red layer in such species as 
A pleurastrophycean (PLOOR-ahs-tro-FIE-see-in) such as Trebouxia, Pseudotrebouxia, or Myrmecia is often the phycobiont, although it can also be a cyanobacterium like Nostoc or Scytonema. The mycobiont is either an ascomycete or a basidiomycete. The apothecarium is the characteristically visible red layer in such species as the British soldier, and is the reproductive structure for the mycobiont. This type of organism makes up a major part of the tundra flora, hence the name "Reindeer Moss". FTP, name this symbiont organism, the union of a fungus and an alga.
A pleurastrophycean (PLOOR-ahs-tro-FIE-see-in) such as Trebouxia, Pseudotrebouxia, or Myrmecia is often the phycobiont, although it can also be a cyanobacterium like Nostoc or Scytonema.
{Lichen}