species. Three or four forms of frond may often be seen on one 
plant. 
Piare 62 represents two states of Lindsea (Schizoloma) ensiformis, Sw., the 
more perfect form with several pinne, and a triphyllous one,—natural size. 
Fig. 1. Portion of a fertile pinna, with sorus. 38. Sorus:—more or less mag- 
nified. 
