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Ceramium periconicum sp. nov. (Ceramiaceae, Rhodophyta): a new subtidal species from Baja California Sur, Mexico
Ceramium periconicum sp. nov. is described from Baja California Sur, Mexico based on the developmental morphology of vegetative and reproductive plants. The new species is characterized by 4–5 periaxial cells, three cortical initials per periaxial cell (a third of which are produced by vertical division and situated between adjacent periaxial cells), absence of basipetal cortical filaments, and by projecting tetrahedral tetrasporangia in seriate series in an abaxial row. Thalli are less than 3 mm tall and occur in dense tufts. C. periconicum differs from most incompletely corticated Ceramium species in that each periaxial cell divides to produce three cortical initials. Within the genus, three cortical initials per periaxial cell have been reported in C. codii and C. reptans. C. periconicum differs from these species in that two cortical initials are directed acropetally and the third is directed laterally, having been cut off vertically from the periaxial cell and maturing without further divisions between the two adjacent periaxial cells. C. periconicum is also distinguishable from other Ceramium species, such as C. australe, C. clarionense, C. macilentum, C. shepherdii, C. caudatum, C. mazatlanense, and C. personatum by the absence of basipetal cortical filaments and by the sequential production of tetrasporangia from the abaxial sides of fertile axes.
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