Which is a genus of more species, Dryopteris or Alonsoa?
Dryopteris Dryopteris , commonly called wood fern, male fern (referring in particular to "Dryopteris filix-mas"), or buckler fern, is a genus of about 250 species of ferns with distribution in Eastern Asia, the Americas, Europe, Africa, and the Pacific islands, with the highest species diversity in eastern Asia. Many of the species have stout, slowly creeping rootstocks that form a crown, with a vase-like ring of fronds. The sori are round, with a peltate indusium. The stipes have prominent scales.
Ceratopteris richardii Ceratopteris richardii is a fern species belonging to the genus Ceratopteris, one of only two genera of the "Ceratopteridoideae" subfamily of the Pteridaceae. It is one of several genera of ferns adapted to an aquatic existence. "C. richardii" was previously regarded as being part of the species "Ceratopteris thalictroides". This particular species is of special scientific interest because a patented strain has been developed as a scientific aid and teaching tool in biology, called "C-fern."