This genus is recognized by having the sterile branches once, twice, or thrice pinnately divided, the two lower side branches being erect and spore-bearing, and quite distinct from the other fronds. These Ferns (all natives of Tropical America) are seen occasionally in market, in small (2-in.) pots, as they are somewhat too tender. The kinds grown are A. Phyllitidis, which has many varieties; and A. rotundifolia, having long narrow drooping fronds with roundish pinnae about 1 in. wide, tinted with purple when young.