But if the conferva or parasitic fungus exceeds its allies in the above respects, it will then be dominant within its own class.

If the plants inhabiting a country as described in any Flora, be divided into two equal masses, all those in the larger genera (i.

e.

, those including many species) being placed on one side, and all those in the smaller genera on the other side, the former will be found to include a somewhat larger number of the very common and much diffused or dominant species.