LITTLE LEAF AND BIG LEAF LINEAGES. “In extant plants, these events are represented by microphyllous leaves in lycophytes (clubmosses, spikemosses and quillworts) and megaphyllous leaves in euphyllophytes (ferns, gymnosperms and angiosperms).”
http://www.nature.com/nature/journal/v434/n7032/abs/nature03410.html