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  1. intergenicula in longitudinal section: (1) 2 rows of long cells alternating with 1 row of short cells;
  1. 2 rows of genicular cells;
  1. imbricated genicular cells:
Amphiroa rigida
  1. intergenicula in longitudinal section: 2-3 rows of long cells alternating with 1 row of short cells;
  1. more than 2 (usually 4) rows of genicular cells;
  1. juxtaposed genicular cells: 
Amphiroa beauvoisii
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