180 BENepict: GENERA OF THE FERN TRIBE VITTARIEAE 
cation is sometimes accompanied by a prolongation of the leaf 
trace to form a partial midvein, thus approaching the Polytaenium 
. type. 
The ontogenetic stages of the several species to be described 
may now be compared in detail with the series of stages derived 
from mature plants, which has just been outlined. 
VITTARIA REMOTA Fée (PLATE 8, Fic. I2-Ig) 
FIGURES 12 and 13 represent clearly the Monogramma darei- 
carpa stage (PLATE 3, FIG. 1). Figure 14 is just as clearly like M. 
subfalcata (PLATE 3, FIG. 6), and FIGURE I5 is the next stage, that 
of Vittaria stkRimensis (PLATE 5» FIG. 18-20). FiGurEs 16,18, 
FIGURE 19 shows another abnormality in having three incomplete 
lateral veins, 
VITTARIA INTRAMARGINALIS Baker (PLATE 8, FIG. I-1 1) 
Vittaria intramarginalis, like V, remota, also starts with the 
Stages. FiGures 3-5 are like the Corresponding stages of V. 
remota (FIG. 14, 15), i. e., they show once and twice forked veins, 
but the branches do not anastomose, hence the stages are to be 
compared with Hecistopteris rather than with Monogramma sub- 
falcata and Vittarig stkkimensis, respectively. (Compare PLATE 8, 
FIG. 3-6, with PLATE 4, FIG. I, 21, 22; 2, 9, 15; 3, 5, 10, 18, 20). 
FIGURE 7 (PLATE 8) should be compared with FIGURE 5 of the same 
plate as showing how the free-veined Hecistopteris type may be 
modified to form the Vittaria type. F IGURES 8-10 are somewhat 
aberrant leaves representing intermediate stages between the leaf 
illustrated in FIGURE 7 and the mature Vittaria type as illustrated 
In FIGURE If, 
POLYTAENIUM LANCEOLATUM (L.) Kaulf. (PLATE 8, FIG. 29-40) 
Polytaenium lanceolatum also Starts with the uninervate Mono- 
gramma dareicarpa Stage (FIG. 38-40). Figure 39 shows an 
