I 



I 



1907] BURLINGAME—SPORANGIUM OF OPHIOGLOSSALES 55 



Fig. 10. Prophase of first division; chromosomes about one-half the length 

 of their earliest stage; food granules in cytoplasm. X 1200. 



Fig. II. Origin of spindle; chromosomes in mature form, many of them 

 seem paired; food granules in cytoplasm; cell appears small because it is not 

 drawn in median optical section. X900. 



Fig. 12. Spindle passing from tripolar to the bipolar stage; food granules 

 and beaded kinoplasmic threads prominent. X900. 



Fig. 13. Surface view of mature spindle at metaphase; cytoplasm unusually 

 free from food granules and kinoplasmic threads. X900. 



formed 



somes mostly free from one another; middle region of cell occupied by persistent 

 spindle fibers, food granules, and denser cytoplasm; old wall becoming freed 

 from contents. X900. 



Fig. 15. Later telophase; a wall has formed, along which the food granules 

 tend to line up; mother-cell wall almost entirely free from contents; chromo- 

 somes quite free from one another. X900. , 



Fig. 16. Part of tapetal Plasmodium containing much starch; tapetal nuclei 

 show the aggregation of chromatic material into elongated masses, far fewer than 

 the chromosomes; mother cell after first division, with a wall and daughter nuclei 

 in resting condition; the whole lies in a vacuole of the plasmodium; old mother- 



shown 



Xooo. 



PLATE IV 



Fig. 17. Usual position of spindle with no wall between, will result in tetra- 

 hedral arrangement of spores; note difference between first and second spindles; 

 many chromosomes left out for clearness. X900. 



Fig. 18. Linear arrangement of spindle; spindle fibers do not come to a 

 point; as in all cases, granular cytoplasm and food granules collect in middle 

 region, whether a wall is present or not. X900. 



Fig. 19. Combination of linear and bilateral arrangement; linear spindle 

 pointed, thougch this was never observed where both spindles are placed linearly; 



Fig. 



figure. X900. 



20. 



spore 



poles. X900 



Fig. 21. Telophase and earliest indication of tetrad walls. X900. 

 Fig. 22. Young tetrad with dense cytoplasm and thin wall. X900. 



ing of spore wall. X900. 



Fig. 25, Depletion of tapetal plasmo' 

 eral spores shown within vacuole. X9cx> 



spore 



lum 



spore -plasm; spore 



under 



X900 



Fig. 27. Spo 



be 



900 



