PLIXTIW 
PHYLETIC RELATIONS 653 
SUPERFICIAL SORI 
Aspidiee Aspleriee 
and Palypodiacea of Pratt. 
LDipleris 
] a 
wh 
Cnoclta 
S Lrichomanes Gobine ’ 
xy 
S Lepreslacdesue 
R Licksonwwe 
Hymenophyllum ; 
- ? Absqphila 
L 
OXS OMA Drapaires 
Osmundace \ | : / SMLRACEE | Clheishoni _esginen 
Narattiaces 
Lotryapteriaee 
SLWIANTS 
\ 
Scheme. to illustrate approximately the relations of the several families of Ferns, as 
concluded from the discussions in the text. It will be noted that the distinctions as 
Simplices, Gradatae, and Mixtae traverse several of the probable evolutionary lines: 
the grouping is so disposed that Ferns with marginal sori lie to the left, with superficial 
sori to the right. No‘attempt is made to connect the lines into a phyletic tree. 
Fig. 354. 
