
Pee Fe Ae ae) see Ve Say ee ene ae ce eee ee, a ee 
ee re ale Fee MARMOT eee one, A ey 
forming plant: nucleus in prophase, showing 
34 BOTANICAL GAZETTE [JULY 
' Germination of zoospore 
Fic. 64.—Zoospore 4 hours after quiescence: cell membrane not yet 
developed; nucleus in resting condition. 
. 65.—Zoospore 20 hours after quiescence: cell wall has developed 
and elongation has begun where wall is thickened. 
1G. 66.—Zoospore 24 hours after quiescence: sporeling has developed in 
three directions; nucleus in prophase shows 22 chromosomes. 
Fic. 67.—Zoospore 26 hours after quiescence: nucleus in metaphase. 
Fic. 68.—Metaphase: axis of mitotic figure perpendicular to that shown 
in previous figure. . 
Fic. 69.—Cross section of sporeling 26 hours old which still has only a 
plasma membrane, although its nucleus has advanced to metaphase: chromo- 
somes in equatorial plate at metaphase clearly 22 in number. 
Fic. 7o.—Anaphase: general contour of sporeling spherical. 
Fic. 71.—Sporeling in 2-celled stage: nucleus of terminal cell in prophase, 
showing 22 chromosomes. 
Fic. 72.—Sporeling in 2-celled stage: nucleus of basal cell in early pro- 
phase, showing 22 chromosomes, 
Fic. 73.—Sporeling in 2 
3 -celled stage: nucleus in terminal cell in metaphase. 
IG. 74.— 
Sporeling in 2-celled stage: nucleus in terminal cell in prophase; 
comparison of mitotic figures in fig. 73 and fig. 74 shows variability in size. 
PLATE III 
Formation of zoosporangium 
Fic. 75-—One of the superficial cells of a young thallus of a zoospore- 
i 44 chromosomes; this division 
ae ri ve rise to Zoosporangium initial and stalk cell. 
ficial ad Petals . ” icial cells of a young thallus, showing a super- 
ee “esporangium initial and stalk cell at the right. 
Fangium initial or zoospore mother cell of char- 
Fic. 78.—Resting nucleus slightly increased in size, 
Fic. 79.—Nuc : 
nuclear oh ses in very early prophase: chromatin network traversing 
Fic. 80.— i i 
Nucleus in early prophase: slightly more advanced than previous 
mag 83.—Formation of 
IG. 84.—Loops sho: t, * r 
Fic. 85.—Loops pent ed and thickened except two belated ones. 

