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Lal 
Nv 
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N 
uw 
EXPLANATION OF PLATES IV-VI 
Zeiss compensating oculars 4 and 6 mm. and Bausch and Lomb objectives 
$, tz, and yy mm. were used. All drawings, except figs. 15, 16, and 18, were 
made with the aid of the camera lucida. ‘The magnifications refer to the figures 
as they appear on the plates, after having been reduced one-half in reproduction. 
Abbreviations: 9,, first prothallial cell; ~,, second prothallial cell; g, genera- 
tive cell; s, stalk cell; 8, body cell; #, tube nucleus; a, arillus; , neck; m:, 
functioning male cell; m,, functionless male cell; vm, ventral canal nucleus; 
* 8g nucleus; m, megaspore membrane; sp, spongy tissue. 
Fig, 1.—Microspore. Xgso. 
Fic, 2.—Spindle for the first prothallial cell. X950. 
Fic. 3.—First prothallial cell cut off. 950. 
FiG. 4—Spindle for the second prothallial cell; first prothallial cell partly 
covered by intine. Xg50. ; 
