=] 
“| Phe Cell as an Individual. 
(°S2r x) “ay-oonads dy} JO pooM ay} WOI ]][99 WAIOJIsng|—bhr “O17 
: spore 
ee jae 
of a fern in various positions 
' Fic. 12.—Tetrahedral cell 
(greatly magnified). 
Fic. 13.—Prismatic cell from the 
bast-parenchyma of a Begonia. 
(x 370). 
