The morphology, physiology and biochemistry of lichens are very different from those of the isolated fungus and alga in culture. Xanthomaculina is a genus of lichenised ascomycetes in the large family Parmeliaceae. High Quality Content by WIKIPEDIA articles! Lichens are composite organisms consisting of a symbiotic association of a fungus (the mycobiont) with a photosynthetic partner (the photobiont or phycobiont), usually either a green alga (commonly Trebouxia) or cyanobacterium (commonly Nostoc). Both Xanthomaculina lichens have an umblicate growth form. It is a genus of only two currently accepted species. Synapomorphic characters for this genus include: a unique cortical chemistry, an umbilicate growth form, distinctive conidial morphology, the presence of cilia, and a vaulted cortex.