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Calliarthron is a genus containing two species of thalloid intertidal alga. Specimens can reach around 30 cm in size. The thalli take a crustose form. The organisms lack secondary pit connections. Calliarthron reproduces by means of conceptacles; it produces tetraspores, dispores and carpospores. The genus has lignin and contains secondary cell walls, traits which are normally associated with the vascular plants. It is similar to the genus Bossiella.
Calliarthron is calcified, but also has uncalcified joints that allow it to flex in response to the waves to which it is subjected. These joints start out calcified, and decalcify as they grow older. After decalcifying they grow much longer, then fatten themselves up in the same way as xylem formation, resulting in secondary walls.
The 2 species currently recognised are:
- C. tuberculosum
- C. cheilosporioides
- Guiry, M.D.; Guiry, G.M. (2008). "Calliarthron". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2009-01-27.
- Martone, Pt; Estevez, Jm; Lu, F; Ruel, K; Denny, Mw; Somerville, C; Ralph, J (Jan 2009). "Discovery of Lignin in Seaweed Reveals Convergent Evolution of Cell-Wall Architecture". Current Biology. 19 (2): 169–75. doi:10.1016/j.cub.2008.12.031. ISSN 0960-9822. PMID 19167225.
- "Calliarthron spp. (erect, geniculate corallines)". Kelp Forest Ecology.
- Paul W. Gabrielson, Kathy Ann Miller, and Patrick T. Martone (2011) Morphometric and molecular analyses confirm two distinct species of Calliarthron (Corallinales, Rhodophyta), a genus endemic to the northeast Pacific. Phycologia: May 2011, Vol. 50, No. 3, pp. 298-316. doi: http://dx.doi.org/10.2216/10-42.1
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