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Description of plates 4and 5 
The photomicrographs of the prothallia on PLATE 4, and FIGS. 13, 14, 15, and 18 
on PLATE 5, represent a magnification of about twenty diameters. FIGs. 19, 20, and 
I on PLATE 5 show a much higher magnification. The apogamously produced 
sporophytes were magnified about two and one half times. All the figures were re- 
duced one seventh in reproduction. 
PLATE 4 
Fic. 1. A ventral view of a prothallium of Aspidium chrysolobum just before the 
nate of the apogamous embryo. 
Fic. 2. similar view of a prothallium of the same species. The apogamous 
atau: is represented as a black region posterior to a pale region in the apical portion 
of 8 dee sien 
A ventral view of a prothallium of Pteris cretica albo-lineata Alexander. 
In - ae region a young embryo is developing. In the apical regions established 
in the lobes tracheids are present. _ 
Fic. 4. A ventral view of a prothallium of Pteris cretica albo-lineata Alexander. 
An embryo with root and leaf has been produced in the new apical phateg of one of 
the lobes. On the inner margin of the oener lobe a young embryo has also appeared. 
In the main yeas region tracheids are visible 
Fic. 5. rsal view of a prothallium ot Aspidium chrysolobum. The prothal- 
lium produced no archegonia. The apogamous embryo appears as a dark region 
posterior to the apical notch. 
Fic. 6. A prothallium of Pieris cretica albo-lineata. A tongue-like portion has 
developed as an outgrowth of the apical region. In the larger secondary prothallium 
he * 20 ’’ region has already appeare 
. 7. A ventral view of a prothallium of Aspidium hirtipes with an embryo 
i root and leaf are produced on the ventral surface 
Fic. 8. An embryo of A. hirtipes witha ‘eell Rewtion ve root. 
Fic. 9. An embryo of A. hirtipes with only the leaf well developed. 
Fic. 10. An embryo of A. chrysolobum, one root of which is on the dorsal surface, 
and the other on the ventral 
Fic. 11. An — 0 of a chrysolobum whose root is on the dorsal surface and 
leaf on the ventral s 
Fic. 12. A young sont of A. hirtipes with ice primary leaves and a 
onee ventral primary r 
