Individual organisms consist of a base of calcified material, tissue in the shape of branching fan-like planes growing out of it.

Plants of Amphiroa beauvoisii grow on the surface of rocks, attached on their undersides by a calcified and crustose base.

[2] In the core of the organism, there are filaments which consist of one to four arched rows of larger cells which are 45–85 micrometers (μm) long.

They are surrounded by a rick of block-like cells, which sometimes eventually shrink, leading to a moat-like depression around the raised conceptacle.

The tetrasporangia are formed around a central column of long sterile cells, and are found in conceptacles with more or less flat floors.

There are concavities 5–14 μm wide on the surface layer of the thallus which are covered in cup-like formations that are calcified, lip-like openings.

It can be differentiated from A. gracilis and A. klochkovana by its intergenicula, which are almost all compressed or flat, and its genicula, which do not include decalcified cells from the peripheral region.

[9] Jean Vincent Lamouroux provided the original description for Amphiroa beauvoisii in 1816, when he described it in his book Histoire des Polypiers Coralligènes Flexibles, Vulgairement Nommés Zoophytes.

[10] He gave the specific epithet "beauvoisii" to honor Palisot de Beauvois, an 18th-century French entomologist and biologist.

[13] While Amphiroa beauvoisii does not have any homotypic synonyms, or officially invalid nomenclature, it does have several illegitimate names.

It has been recorded from the Mediterranean, the Indian Ocean, the Gulf of California, the Caribbean, and the South African coast.

A population of A. beauvoisii will reproduce and persist both through germinating spores form these reproductive fronds as well as by re-growing the holdfast of the organism.

[22] Amphiroa beauvoisii has been tested for bioactive properties, but showed no activity in antibacterial, antifungal, antiviral, cytotoxic, or antimitotic applications.