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A B
  1. raised, grouped, even overlapped conceptacles present on the tips of lumpy excrescences;
  1. elliptical conceptacles with frequent (characteristic) triangular concavities above chambers (in transverse section) (235-530mm in diameter).
Lithothamnion minervae
  1. conceptacles grouped and crowded on excrescences or knobbly protuberances, never overlapped;
  1. elliptical conceptacles (in transverse section).

tab. 12
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