1921] HAUPT—REBOULIA 453 
EXPLANATION OF PLATE XXXIII 
Fic. 12.—Sporogenous tissue; 720. 
Fic. 13.— Young spore mother cells in amoeboid stage and young elaters; 
Fic. 14.—Older stage showing development of cell walls around spore 
gir cells and elaters; 720. 
15.—Older stage of same; X72 
aE 16.—Spore tetrad showing ied of spore coats and elater; 
720. 
Fic. 17.—Nearly mature spore and elater showing development of epispore 
on former and double spiral band on latter; 720. 
