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A B C
  1. germination disc with: 4 central cells (c), 4 lateral cells (bilateral symmetry) and often with 4 atrophic cells (at):
  1. chambers of tetrasporangial conceptacles: 65-94µm (diam.) (bisporangial conceptacles: 166-208µm in diameter).
Hydrolithon boreale
  1. germination disc with: 4 central cells (c), 8 pericentral cells (radial symmetry);
  1. chambers of tetrasporangial conceptacles: (95) 105-130 (155)µm (diam.).
Hydrolithon cruciatum
  1. germination disc with: 4 central cells (c), 12 pericentral cells (radial symmetry):
  1. chambers of tetrasporangial conceptacles: 65µm (diam.)
Hydrolithon farinosum
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