Irish moss, is a member of
Chondrus crispus is a red algae which is an Irish moss. The word Iris means "little rock", it is a species of red alga which grows abundantly along rocky parts.
Other options: True moss belongs to class Bryopsida of division Bryophyta. Lichens are symbiotic association of algae with fungi found in moist habitat. Division Bryophyte exist in moist and aquatic environment called as amphibians of plant kingdom.