i9i 2] YAMANOUCHI—CUTLERIA 



499 



Fig. 127. — Nucleus in metaphase: contour of sporeling almost spherical. 



Fig. 128. — Polar view of same stage as in previous figure: 24 chromosomes. 



Fig. 129. — Polar view of metaphase showing 24 chromosomes: character- 

 istic elongation and the thickened cell wall of the elongated part are recog- 

 nizable. 



Fig. 130. — Metaphase of same stage as in previous figure: axis of the 

 figure is perpendicular to that of the previous one. 



Fig. 131. — Anaphase. 



Fig. 132. — Metaphase of the similar stage as in figure 130, but axis of the 

 figure is perpendicular to that. 



Fig. 133.— Anaphase. 



Fig. 134. — Late telophase: elongation of the sporeling is remarkable. 



Fig. 135. — Sporeling of 2-celled stage: nuclei in resting condition. 



Fig. 136. — Sporeling of 2-celled stage: nucleus of terminal cell in prophase; 

 24 chromosomes present. 



Fig. 137. — Sporeling of 2-celled stage: nucleus of terminal cell in meta- 

 phase viewed from pole; nucleus of basal cell in prophase; 24 chromosomes 

 present. 



Fig. 138. — Sporeling of 2-celled stage: nucleus of terminal cell in prophase; 

 form of the chromosomes is rather long. 



Fig. 139. — Sporeling of 2-celled stage: nucleus in basal cell in anaphase. 



Fig. 140. — Sporeling of 2-celled stage: nucleus in terminal cell in late telo- 

 phase and that of basal cell in metaphase, showing 24 chromosomes in polar 

 view. 



Fig. 141. — Sporeling in 3-celled stage: nucleus of basal cell in prophase, 

 showing 24 chromosomes. 



Fig. 142. — Sporeling in 3-celled stage: nucleus of 

 showing 24 chromosomes. 



FlG. 143. — Sporeling in 3-celled stage: nucleus of basal cell in metaphase. 



Fig. 144. — Sporeling of 1 2-celled stage. 



Fig. 145. — Sporeling of 13-celled stage. 



Fig. 146. — Sporeling of 2 2-celled stage. 



PLATE XXXI 



The formation of the zoosporangium of Aglaozonia reptans 

 Fig. 147. — Portion of a young thallus, showing a single layer of super- 



mi 



iperficial 



ficial cells and the larger ceils below. 



Fig. 148.— Pc 



cells, hypodermai cells, and the larger ceils below. 



Fig. 149. — Portion of thallus in more advanced stage. 



Fig. 150. — Portion of thallus in still more advanced stage: superficial cells 

 have grown in size and will be zoosporangia or zoospore mother cells. 



Fig. 151.— Young zoospore mother cell and stalk cell. 



Fig. 152. — Zoospore mother cell of characteristic club-shape; nucleus in 

 resting condition. 



