Callithamnion
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''Callithamnion'' is a genus of
algae Algae ( , ; : alga ) is an informal term for any organisms of a large and diverse group of photosynthesis, photosynthetic organisms that are not plants, and includes species from multiple distinct clades. Such organisms range from unicellular ...
belonging to the family Callithamniaceae. The genus was first described by Danish botanist
Hans Christian Lyngbye Hans Christian Lyngbye (29 June 1782 – 18 May 1837) was a Danish priest and botanist, specialising in algae. Life Hans Christian Lyngbye was born in Aalborg, Denmark, in 1782, the son of a teacher, Jens Michelsen Lyngbye. He attended the Latin sc ...
in 1819, and the type species is ''Callithamnion corymbosum'' ., The genus has
cosmopolitan distribution In biogeography, a cosmopolitan distribution is the range of a taxon that extends across most or all of the surface of the Earth, in appropriate habitats; most cosmopolitan species are known to be highly adaptable to a range of climatic and en ...
. Species are found in Europe (including Norway and Great Britain,), Australia, America (including Massachusetts, New York, North Carolina and Georgia),
Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...
(Canada),
Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...
and South Africa. The genus of ''Callithamnion'' has undergone 2 major changes in its history.
Carl Nägeli Carl Wilhelm von Nägeli (26 or 27 March 1817 – 10 May 1891) was a Swiss botanist. He studied cell division and pollination but became known as the man who discouraged Gregor Mendel from further work on genetics. He rejected natural selecti ...
(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.


Description

Callithamnion species are a marine red alga that is monaxial (having only one axis) with free filaments and the
thalli Thallus (: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. A thallus usually names the entir ...
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 A gametophyte () is one of the two alternation of generations, alternating multicellular organism, multicellular phases in the life cycles of plants and algae. It is a haploid multicellular organism that develops from a haploid spore that has o ...
and
sporophytes A sporophyte () is one of the two alternating multicellular phases in the life cycles of plants and algae. It is a diploid multicellular organism which produces asexual spores. This stage alternates with a multicellular haploid gametophyte pha ...
are found throughout the year, but are usually only fertile in the late summer and autumn.


Species

As accepted by
WoRMS The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ...
and
AlgaeBase AlgaeBase is a global species database of information on all groups of algae, both seaweed, marine and freshwater algae, freshwater, as well as sea-grass. History AlgaeBase began in March 1996, founded by Michael D. Guiry, Michael Guiry. Text ...
; * '' 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''


References

{{Authority control Ceramiales Red algae genera Plants described in 1819