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  1. branches diameter: up to 1.5-2mm;
  1. epithallial cells: flared;
  1. cells of branches:
    medulla:
    • rectangular;
    • (15) 20-25 (30)µm long,
    • 7-12µm in diameter;

    cortex:
    • rectangular-tapered;
    • 20-25µm long,
    • 5-8µm in diameter.
Lithothamnion corallioides
  1. branches diameter: up to 6mm;
  1. epithallial cells: rounded, flattened never flared;


  1. cells of branches:
    medulla:
    • rectangular;
    • 10-15µm long,
    • 5-10 µm in diameter;

    cortex:
    • rectangular-ovoid ;
    • 5-10µm long,
    • 3-5 µm in diameter.
Phymatolithon calcareum
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