Phylogenetic congruence between housekeeping and microcystin synthetase genes. Congruence between housekeeping genes of the producer organism (16S rRNA, rpoC1, rpoB, tufA and rbcL) on the left and the microcystin synthetase genes (mcyD, mcyE, and mcyG) on the right. Maximum-likelihood tree based on five housekeeping genes (-lnL = 20872.57747) and 3 microcystin synthetase genes (-lnL 21445.80119). Bootstrap values above 50% from 1000 maximum-likelihood bootstrap replicates are given at the nodes. Branch lengths are proportional to sequence.