56 



BOTANICAL GAZETTE 



[JCJLY 



Fig. 28. Spore coat distinctly differentiated into two layers; the cytoplasm 

 much denser and showing very small starch grains. X900. 



Fig. 29. Mature spore with thick wall and abundant contents; starch very 

 abundant; intine penetrates exine at tip of spore. X900. 



Fig. 30. Much delayed division of a mother cell, spore -coat-like wall sur- 

 rounding it. X800. 



Figs. 31, ^2, Multicellular gametophytic (presumably) masses of cells, 

 which have arisen through the cooperative germination of the members of a 

 tetrad which failed to separate in the ordinary way. X2;j^, 



Fig. 33. Three of the four spores of a tetrad within a common exospore. 

 X6oo 



