104 ETTER: POLYEMBRYONY IN POLYPODIACEOUS FERNS 
Regeneration usually produced a new normal heart-shaped 
gametophyte on which two sporophytes commonly developed, 
as is illustrated by Text FIG. 5, A. The larger sporophyte, 4, 
was seen later than the smaller one, a. It is interesting to 
note here that the smaller one, although older, was not 
doing as well as the younger one, which was located nearer the 
apical sinus of the regenerated part. That more nutritious food 
is available there seems reasonable. TExT FIG. 5, B, c, is a 
sporophyte which developed on the other original lobe near the 
region of the apical sinus, no regenerated part having been 
formed. 
G. 6. Gametophyte of Dryopteris mollis bearing two 2 oie 
A, 8 sporophyte on the old half of the original gametophyte, a; c, in ap- 
proximately the boundary line between A and B. 8B, the regenerated game- 
tophyte, b, bearing the younger but more thrifty sporophyte. 
Fic. 7. Two sporophytes on regenerated yearns of Matteuccia 
ae aE: a, old half of original prothallium; c, approximate boundary 
line between the old and new parts; 6, the remmecated prothallium. 
It was not uncommon to find that, after a regenerated part 
had attained a width of 7-8 mm. across the lobes, a sporophyte 
came from the old original part ahead of one on the regenerated 
rt. From all appearances the entire prothallium, including 
old and new parts, was morphologically one with the old midrib 
branched. is phenomenon is illustrated in TEXT FIG. 6. 
The smaller but older sporophyte, A, came well back on the 
broadened cushion, six days previous to the appearance of the 
