358 
Pleistophora gigantea, Tlielohaii 
The sporoblasts are covered by a thin membrane. During their 
formation there has been an increase of protoplasmatic substance, con¬ 
sequently they are placed so closely together that each sporoblast takes 
a more or less distinct angular shape. The membrane of each sporoblast 
sticks readily to the membranes of the surrounding sporoblasts, conse¬ 
quently all the sporoblasts, and even the neighbouring spores, hold 
together, forming a pseudo-tissue, resembling somewhat the parenchy¬ 
matous tissue of a plant. The sporoblasts have a diameter of 3‘5-4'9;U. 
Diagram XVII. Eepresentiug the same cyst as that shown in Diagram XVI, but at 
a higher magnification (of Diagram II). a. sporoblasts. 6. pansporoblast with 
three pairs of nuclei. c. spores. 
{d) Fol'mation of the spores. When a sporoblast is transformed 
into a spore, the membrane becomes much thicker, the protoplasm loses 
its vacuoles and is deeply stained. In living spores the protoplasm 
tills the whole lumen within the spore-wall, but in fixed and stained 
