lichen
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. /ref> This is to be compared to a
corticolous lichen A corticolous lichen is a lichen that grows on bark.Alan Silverside's Lichen Glossary (a-f), Alan Silverside/ref> This is contrasted with lignicolous lichen, which grows on wood that has had the bark stripped from it,Alan Silverside's Lichen Glos ...
that grows on bark,Alan Silverside's Lichen Glossary (a-f), Alan Silverside /ref> and
saxicolous lichen
A saxicolous lichen is a lichen that grows on rock. The prefix "sax" from the Latin means "rock" or "stone".
Characteristics
Saxicolous lichens exhibit very slow growth rates. They may develop on rock substrates for long periods of time, give ...
s that grow on rock.Alan Silverside's Lichen Glossary (p-z), Alan Silverside /ref>