1918] BUCHHOLZ—PINUS 227 
lower end containing the nucleus; thick deposit of material, basal plate (), 
is shown on upper wall of rosette; June 24, 1916 
Fic. 42.—Suspensor, of which lower end is beginning to enlarge into a 
balloon; June 24, 1916. 
Fic. 43.—Embryo complex from 2 adjacent archegonia with 8 primary 
embryos prceet one I - of pret (6 embryos forming; all first embryonal 
tubes have d embryonal tubes are about to elongate; 
June 30, ror; 
Fic. 44.—Embryos from 1 archegonium of about the same stage as 
fig. 43; 1 embryo has been left far behind in the “struggle for supremacy”’; 
June 22, 1914. 
Fic. 45.—Embryo complex similar to fig. 43, but rather more advanced; 
a balloon-like enlargement may be seen at end of 1 primary suspensor; one 
of the 8 embryos has been aborted and one left far behind; July 1, 1016. 
Fic. 46.—Embryo system from 1 archegonium in which primary sus- 
pensors ahd first embryonal tubes of secondary suspensors have fully elon- 
gated, while next divisions of suspensors are nearly half elongated; July 1, 
1910. 
Fic. 47.—Embryo in which third division of suspensor has completely 
elongated and succeeding portions of suspensor are beginning to form embry- 
onal tubes of unequal lengths that break joints; i slightly crushed 
below, thus separating embryonal tubes; July 5, 1916. 
Fic. 48.—Embryo slightly older than in fig. me het with less developed 
suspensor becoming massive very suddenly; June 29, 1916. 
Fic. 49.—Embryo with very typical suspensor forming fourth suspensor 
division (third secondary portion), with young embryonal tubes beginning 
at base; July 5, ro16. 
Fic. 50.—Embryo of somewhat older stage than fig. 40. 
Fic. 51.—Later massive embryo with characteristic secondary suspensor 
made up of dovetailed embryonal tubes (or tubes that break joints) in which 
suspensor divisions no longer appear; July 8, 1916. 
1G. 52.—Older embryo than fig. 51 shortly before differentiation of body 
regions; July 8, 1916. 
Fic. 53.—Rosette in early stage of elongation (cases of elongating rosette 
cells are found in 5 per cent of embryos of P. Banksiana). 
“IG. 54.—Rosette fully elongated, with a mitotic figure in lower end of one 
of its cells; June 30, 1916 
1G. 55.—Detail of lower end of elongated rosette of fig. 54, showing 
division spindle. 
Fic. 56.—Rosette elongated and divided into embryo of many cells, of 
which dst 54 and 55 was a delayed beginning; June 30, 1916. 
G. 57.—Rosette ent similar to fig. 56, with suspensor tube broken off 
from mad 
