1899] MICROSPORANGIA OF HEMEROCALLIS FULVA 85 
spore-mother-cells of Mymphea alba and Limodorum abortivum, 
and also in the tapetal cells of Magnolta Yulan. A number 
of spindles from cells of the above-named plants and also from 
the cells of Nuphar luteum, having well defined centrospheres and 
radiations around the poles, are shown. 
If the fifth nucleus in figs. 20 and 27 was formed by the 
division of one of the tetrad nuclei, the division was probably 
normal. In this case the presence of spindles suggesting tri- 
polar mitosis would be explained by the persistence of spindle 
structures as in fig. 77. Fig. 22 is similar to figs. 20 and 22, 
except that one of the cells resulting from the first division of 
the spore-mother-cell did not divide. /%g. 23 may have arisen 
by any one of the processes described under figs. 20 and 27, 
but since there is no spindle connecting either of the two smaller 
nuclei with one of the larger, they may have arisen from a chro- 
mosome which was isolated in the first division of the spore- 
mother-cell, forming a nucleus and afterward dividing. In this 
case but one of the cells resulting from the first division could 
have divided, as there are only three other nuclei present. How- 
ever, the three are nearly uniform in size, and all have the general 
appearance of tetrad nuclei, and not the appearance of a nucleus 
formed in the first division, as the elongated nucleus in fig. 22, 
which has the usual shape of such nuclei. 
Hig: 24 shows four nuclei, two of which are dividing by 
karyokinesis, The appearance and position of the cell walls, as 
well a the unequal size of the nuclei, suggests that the two nuclei 
tae from the first division of the spore-mother-cell were of 
oo By the subsequent division of the nuclei thus 
again dec pairs of nuclei resulted; the larger pair of a are 
y Su ee by karyokinesis. This figure may also be explained 
an ead the two smaller nuclei to have been produced from 
could =e op paamigag In this case the spore-mother-cell 
One ce “i ee but once, and is now dividing a second time: 
niche ve nuclei in fig. 25 is dividing. The source of this 
not be determined with certainty ; but it may have been 
forme . . 
¢ cither by the indirect division or by the fragmentation 
