Examples of results from fusibility experiments.

Young sponges grown from gemmules of the same strain, Pe1 and Pe2 (A) and of different strains, V1 and V2 (B) and aligned fragments of sequence electropherograms (c and d, respectively) from direct sequencing with the reverse primer 28S5′rev (around the region of the indel at position 247 of ITS2). The black arrow (B) shows the barrier formed between two individuals that signifies them belonging to different strains.