Helen M. Armour. 
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of the frond also give evidence of the difference between them. For 
Dipteris bifurcata has a narrow lamina andlarge sori arranged in 
regular rows, one on either side of the mid-rib, as shown in Fig. 12, 
Fig. 12. 
Fig. 13. 
Fig. 12. Dipteris bifurcata Baker (—Lobliana (Hk) Moore) parts of two 
pinnae showing narrow form, venation, and regular sequence ot sori. Natural 
size. 
Fig. 13. Dipteris conjugates. • Rein Portion of leaf showing extended 
surface, webbing between the pinnae, the venation, and numerous sori spread 
over the enlarged surface. Natural size. 
while in Dipteris conjugata the lamina is broad, the sori are small 
and very numerous (Fig. 13). Intermediate between these two species 
in outline of leaf and distribution of sori comes the species, Dipteris 
quinquefurcata (Baker), Christ, in which the segments are still linear, 
though broader than in Dipteris bifurcata, with clearly marked meshes 
of the venation in which several sori are situated, in place of the one 
