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A B
  1. thickened edge due to coalescence of contiguous thalli;
  1. tetrasporangial conceptacles uniporate slightly sunken in the thallus;
  1. secondary pit-connections (p2).
Lithophyllum incrustans
  1. edge grown thin also between adjacent thalli;
  1. multiporate (50-100 pores), slightly raised (often confluent) tetrasporangial conceptacles;
  1. cell fusions (fc).
Lithothamnion sonderi
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