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A B C
  1. raised tetrasporangial conceptacles, large well evident (also after shedding), or sunken in the thallus (therefore apparently absent).

tab. 19
  1. tetrasporangial sori sunken in the thallus, visible as pores on the surface of the thallus (NB: cruciate tetraspores).

Sporolithon ptychoides
  1. (gametangial, carposporangial, tetrasporangial) conceptacles absent (due to thallus immaturity) also after sectioning or fracture.


tab. 27
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