Callithamnion

{{Short description|Genus of algae}}

{{Use dmy dates|date=February 2021}}

{{Automatic taxobox

|image = Callithamnion corymbosum Crouan.jpg

|image_caption = Callithamnion corymbosum

|status =

|status_system =

|status_ref =

|taxon = Callithamnion

|authority = Lyngbye, 1819

|synonyms = {{species list

|Aristothamnion |J.Agardh, 1892

|Ceratothamnion |J.Agardh, 1892

|Dasythamnion |Nägeli, 1862

|Dorythamnion |Nägeli, 1861

|Leptothamnion |Kützing, 1849

|Phlebothamnion |Kützing, 1843 }}

|synonyms_ref = {{cite web |title=WoRMS - World Register of Marine Species - Callithamnion Lyngbye, 1819 |url=https://www.marinespecies.org/aphia.php?p=taxdetails&id=143832 |website=www.marinespecies.org |access-date=8 December 2022}}

}}

Callithamnion is a genus of algae belonging to the family Callithamniaceae.{{cite web |title=Callithamnion Lyngbye, 1819 :: Algaebase |url=https://www.algaebase.org/search/genus/detail/?genus_id=126 |website=www.algaebase.org |access-date=8 December 2022}}

The genus was first described by Danish botanist Hans Christian Lyngbye in 1819,{{Cite book|last=Feldmann-Mazoyer|first=G.|title=Tentamen hydrophytologiae danicae |publisher=Hafniae, typis Schultzianis, in commissis Librariae Gyldendaliae |year=1819 |isbn=|location= |pages= |language=Latin}} and the type species is Callithamnion corymbosum {{Au|(Smith) Lyngbye}}.,

The genus has cosmopolitan distribution.{{cite web |title=Callithamnion Lyngbye, 1819|url=https://www.gbif.org/species/2658493 |website=www.gbif.org |access-date=8 December 2022 |language=en}} Species are found in Europe (including Norway and Great Britain,Marine Biological Association of the United Kingdom {{google books|bpdGAQAAMAAJ|Journal of the Marine Biological Association of the United Kingdom (1887)|page=161}}), Australia,{{cite web |title=Genus: Callithamnion |url=https://bie.ala.org.au/species/NZOR-6-23605 |website=bie.ala.org.au |publisher=Atlas of Living Australia |access-date=8 December 2022 |language=en-AU}} America (including Massachusetts, New York, North Carolina and Georgia), Newfoundland (Canada),{{cite journal |last1=Whittick |first1=Alan |title=Culture and field studies on Callithamnion hookeri (Dillw.) S. F. Gray (Rhodophyta: Ceramiaceae) from Newfoundland |journal=British Phycological Journal |date=1981 |volume=16 |issue=3 |pages=289–295 |doi=10.1080/00071618100650311}} Sri Lanka and South Africa.{{cite web |title=South African Seaweeds - south coast |url=http://southafrseaweeds.uct.ac.za/descriptions/red/callithamnion_collabens.php |website=southafrseaweeds.uct.ac.za |access-date=8 December 2022}}{{cite journal |last1=Reddy |first1=Maggie M. |last2=Stegenga |first2=Herre |last3=Anderson |first3=Robert J. |last4=Bolton |first4=John J. |title=An updated species inventory of Callithamnion sensu lato Rhodophyta, Callithamniaceae in South Africa with the description of Callithamnion africanum sp. nov. |journal=Phytotaxa |date=6 October 2020 |volume=461 |issue=3 |doi=10.11646/phytotaxa.461.3.1}}

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.Carl Nägeli, 1861, Beiträge zur Morphologie und Systematik des Ceramiaceae. Sber. bayer. Akad. Wiss. Jb. 1861, Vol. 1, pp. 297–415, Plate 1. 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.