Corallinales

order of algae

Mesophyllum is a genus of red alga belonging to the family Hapalidiaceae.

Phymatolithon is a genus of non geniculate coralline red algae, known from the UK, and Australia. It is encrusting, flat, and unbranched; it has tetrasporangia and bisporangia borne in multiporate conceptacles. Some of its cells bear small holes in the middle; this distinctive thallus texture is termed a "Leptophytum-type" thallus surface, and has been posited as a taxonomically informative character. It periodically sloughs off its epithallus, reducing its overgrowth by algae by as much as 50% compared to bare rock.

Hapalidiaceae is a family of red alga belonging to the order Corallinales.

Choreonema is a genus of red algae belonging to the family Hapalidiaceae.

thumb|Maerl off the coast of the Isle of Arran thumb|Calcified remains of maerl, on the "coral beach" in the Isle of Skye thumb|Maerl in Lanildut. thumb|Pieces of popcorn-like maerl from Fuerteventura island. Maerl (also rhodolith) is a collective name for non-geniculate coralline red algae with a certain growth habit. Maerl grows at a rate of c. 1 mm per year. It accumulates as unattached particles and forms extensive beds in suitable sublittoral sites. The term maerl originally refers to the branched growth form of Lemoine (1910) and rhodolith is a sedimentological or genetic term for b

species of alga

species of alga