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Corallina officinalis

Phylum: Rhodophyta
Class: Floredeophyceae
Order: Corallinales
Family: Corallinaceae
Genus: Corallina
Species: C. officinalis (1)

pic (1)

Picture
Phylogenetic tree (5)
Description:
  • A calcified red seaweed, a coralline alga (1)
  • A jointed or geniculate coralline alga (1)
  • The fronds grow in tufts that develop from a flat coralline base (1)
  • They are segmented to provide flexibility in seawater and oppositely branched (1)
  • Dull purple but its colour can vary depending on the conditions; can appear red, yellow or white when bleached in bright light (1)
  • Usually 1 to 12 cm tall (1)
  • Classified as Archaeplastida and are most often characterized by the presence of the red pigment phycoerythrin (2)

Picture
Habitat Distribution (4)
Habitat(1):
  • Distribution is not yet fully known, it occurs in the North Atlantic
  • Found in rock pools in the middle and lower shore
  • Often forms a distinct zone just below the rim of rock pools
  • Also lives on rocks on the lower shore and in shallow water
Nutrition(1):
  • Photoautotrophic
Reproduction(1):
  • Male and female reproductive structures are found on separate plants; these structures develop in conceptacles - tiny flask-shaped structures just visible to the naked eye
  • After fertilization, diploid spores are released which grow into a phase called the tetrasporophyte
  • The tetrasporophytes look just like the male and female plants but they develop conceptacles which contain tetrasporangia
  • Each tetrasporangium contains four spores
  • When mature, meiosis occurs in the tetrasporangium and haploid tetraspores are released
  • The haploid tetraspores grow into male and female plants

Picture
Life cycle (3)
Conservation Status(1):
  • Common, does not seem to be threatened
  • It is unknown how it and its other calcified relatives will respond to ocean acidification
Interesting Facts (1):
  • Provides a home for small sea creatures and often has other seaweeds growing on it
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