  We analyse forty seven chloroplastid genes of the large subunit of RuBisCO,
from the Algal order Ectocarpales, sourced from GenBank. Codon-usage weighted
by the nucleotide base bias defines our score called the
Codon-Impact-Parameter. This score is used to obtain phylogenetic relations
amongst the 47 Ectocarpales. We compare our classification with the ones done
earlier.
