Parietinwas secreted by mycobiont absorbs blue light and provides protection to photobiont
against drastic sun rays (Gauslaa and McEvoy, 2005).
The lichens, as a group of the symbiotic organisms, composed by the association of photobiont
(generally Cyanobacteria and Chlorophyta) and fungi, produce a range of secondary compounds, most of which specific (Rundel 1978).
Of the 100 species of lichen-forming fungi, the majority (80 species, 80%) was associated with green coccoid algal photobionts
and 17 species (17%) were associated with the chain-forming green algal photobiont
Lichens are composite organisms consisting of a symbiotic association between a fungal partner (mycobiont) and one or more photosynthetic partners (photobiont
) usually either green algae or cyanobacterium or both.
Lichens are generally defined as symbiotic organisms resulting from the successful association between a fungus (the mycobiont) and an extracellularly located photosynthetic partner (the photobiont
), which in most cases is represented by green algae, but it can also be replaced by cyanobacteria (10% of lichen symbiosis) or by the simultaneous association of both algae and cyanobacteria (3-4%) .
Lichens are symbiotic organisms of photobiont
Wu, "Effects of copper on wild and tolerant strains of the lichen photobiont
Trebouxia erici (chlorophyta) and possible tolerance mechanisms," Archives of Environmental Contamination and Toxicology, vol.
One hundred and seventy-eight (88%) species have green algae as a primary photobiont
, eight (4%) species have cyanobacteria as their primary photobiont
, and 17 species (8%) are nonlichenized fungi traditionally treated with lichens.
Lichen is a symbiotic association between two different organisms; one is the alga (Photobiont
) another is fungus (Mycobiont).
Lichens are in fact an ecosystem comprising of a photobiont
that can either be a green alga (Chlorophyta) or a cyanobacterium and a mycobiont that in most cases belongs to the Ascomycetes.