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A B
  1. multiporate tetrasporangial conceptacles possessing apical plugs (t);


…or should conceptacles be absent:
  1. epithallial cells with flattened and flared cell walls;
  1. monomerous thalli lacking coaxial core of filaments (crustose portions).
Lithothamnion philippii
  1. uniporate, hemispherical, conical or flask-shaped tetrasporangial conceptacles with pore nearly evident (sometimes on warty protuberances);


…or should conceptacles be absent:
  1. epithallial conceptacles with rounded, flattened but not flared cell walls;
  1. monomerous thalli with coaxial core of filaments (crustose portions).

tab. 17
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