Callithamnion

Callithamnion is a genus of algae belonging to the family Callithamniaceae.

The genus was first described by Danish botanist Hans Christian Lyngbye in 1819, and the type species is Callithamnion corymbosum .,

The genus has cosmopolitan distribution. Species are found in Europe (including Norway and Great Britain, ), Australia, America (including Massachusetts, New York, North Carolina and Georgia), Newfoundland (Canada), Sri Lanka and South Africa.

The genus of Callithamnion has undergone 2 major changes in its history. Carl Nägeli (in 1861) transferred species without alternate branchlets to Antithamnion, Rhodochorton and Acrochaetium. Then Genevieve Feldmann-Mazoyer in 1941 created genus Aglaothamnion for species having uninucleate cells, zig-zag carpogonial branches and lobed groups of carposporangia, and re-circumscribed Callithamnion. Aglaothamnion is now sometimes regarded as a synonym of Callithamnion with insufficient evidence for separate evolutionary lines of development.

Description
Callithamnion species are a marine red alga that is monaxial (having only one axis) with free filaments and the thalli are usually small tufts. They are also erect, up to 10 cm tall, with irregular branching and have multinucleate cells. In most species are gametophytes and sporophytes are found throughout the year, but are usually only fertile in the late summer and autumn.

Species
As accepted by WoRMS and AlgaeBase;


 * Callithamnion acutum
 * Callithamnion aglaothamniodes
 * Callithamnion apiculatum
 * Callithamnion apiculatum
 * Callithamnion arborescens
 * Callithamnion arrawarricum
 * Callithamnion axillare
 * Callithamnion biseriatum
 * Callithamnion bisporum
 * Callithamnion brachygonum
 * Callithamnion callithamnioides
 * Callithamnion catalinense
 * Callithamnion caulescens
 * Callithamnion circinnatum
 * Callithamnion codicola
 * Callithamnion colensoi
 * Callithamnion collabens
 * Callithamnion compactum
 * Callithamnion confertum
 * Callithamnion consanguineum
 * Callithamnion corymbosum
 * Callithamnion crispulum
 * Callithamnion cryptopterum
 * Callithamnion dasytrichum
 * Callithamnion debile
 * Callithamnion ecuadoreanum
 * Callithamnion ellipticum
 * Callithamnion elongellum
 * Callithamnion epiphyticum
 * Callithamnion exiguum
 * Callithamnion fallax
 * Callithamnion flabellatum
 * Callithamnion flagellare
 * Callithamnion gaudichaudii
 * Callithamnion gracile
 * Callithamnion grande
 * Callithamnion granulatum
 * Callithamnion griffithsioides
 * Callithamnion hamelii
 * Callithamnion hirtellum
 * Callithamnion hypneae
 * Callithamnion implicatum
 * Callithamnion japonicum
 * Callithamnion kirillianum
 * Callithamnion korffense
 * Callithamnion lanceolatum
 * Callithamnion larcinum
 * Callithamnion lasioides
 * Callithamnion marshallense
 * Callithamnion mildbraedii
 * Callithamnion montagnei
 * Callithamnion mytili
 * Callithamnion nipponicum
 * Callithamnion octosporum
 * Callithamnion pacificum
 * Callithamnion parvulum
 * Callithamnion paschale
 * Callithamnion pedicellatum
 * Callithamnion pennula
 * Callithamnion perpusillum
 * Callithamnion pikeanum
 * Callithamnion pinastroides
 * Callithamnion pinnatum
 * Callithamnion planum
 * Callithamnion plumulum
 * Callithamnion propebyssoides
 * Callithamnion puniceum
 * Callithamnion purpuriferum
 * Callithamnion pylaisaeanum
 * Callithamnion ramosissimum
 * Callithamnion reductum
 * Callithamnion rigescens
 * Callithamnion roseum
 * Callithamnion rupicola
 * Callithamnion rupinicola
 * Callithamnion semicorticatum
 * Callithamnion shepherdii
 * Callithamnion soccoriense
 * Callithamnion spinuliferum
 * Callithamnion stuposum
 * Callithamnion subsecundum
 * Callithamnion subverticillatum
 * Callithamnion tetragonum
 * Callithamnion tetricum
 * Callithamnion unilaterale
 * Callithamnion variegatum
 * Callithamnion veleroae
 * Callithamnion vieillardii
 * Callithamnion violaceum