lithothamnion
noun
lith·o·tham·ni·on
1
capitalized : a genus of crustose reef-forming red algae (family Corallinaceae) that are abundant in post-Jurassic geologic strata and are represented by numerous recent forms growing chiefly on rocks and other algae
2
plural -s : any plant of the genus Lithothamnion
Word History
Etymology
New Latin, from lith- + Greek thamnos bush + -ion (diminutive suffix)