Xichols. A morphological study of Juniperus communis var. depressa. 241 
Fig. 95. Entrance of two male cells from one pollen tube into different 
archegonia. X 306. 
Figs. 96—100. General appearance consugating male and female nuclei. . 
The cytoplasm and starcli of the male cell are indicated by tbe dotted lines. 
X 306. 
Plate XVII. 
Fertilization and the development of the proembryo. 
Fig. 102. Male nucleus and egg in contact and surrounded by mantle 
of starch. X 640. 
Fig. 103. Fusion nucleus. More or less definite spirems have already 
beeil organized. Partly reconstructed from two of the three sections into which 
the nucleus was cut by the razor. X 640. 
Fig. 104. Fusion nucleus just before first Segmentation division. Two 
distinct spirems are present. X 640. 
Fig. 105. Late prophase in first division of fertilized egg. The chro- 
mosomes are being oriented at a common equatorial plane. X 640. 
Fig. 106. Telophase of Segmentation division. X 640. 
Fig. 107. Daughter nuclei of segmentatioii division. X 640. 
Fig. 108. Second free nuclear division of proembryo. X 392. 
Fig. 109. The four nuclei resulting from this division. X 392. 
Fig. 110. Third free nuclear division of proembryo. X 392. 
Fig. 111. An unusual instance where sixteen free nuclei are being de- 
veloped before wall formation. X 306. 
Fig. 112. First nuclear division following formation of walls. X 306. 
Fig. 113. The same completed. X 306. 
Fig. 114. Proembryo after slight elongation of suspensors. X 160. 
Beihefte Bot. Centralbl. Bd. XXV. Abt. I 
Heft 2. 
16 
