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I - conceptacles present
A
  1. uniporate conceptacles;
  2. tetrasporangial conceptacles more or less superficial.

tab. 31
B
  1. uniporate conceptacles;
  2. tetrasporangial conceptacles sunken or not very prominent.

tab. 36
C
  1. multiporate conceptacles;
  2. tetrasporangial conceptacles superficial.

tab. 39
D
  1. multiporate (30-60 pores) conceptacles;
  2. tetrasporangial conceptacles sunken in the thallus (≤ 1.2mm thick) or slightly raised with orbital ring.

Phymatolithon calcareum

II - conceptacles absent
E

tab. 27
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