316 



BOTANY 



by the broad, overlapping leaf -bases, forming a structure like the 

 scaly bulb of an Onion. The slender cylindrical leaf also suggests 



FIG. 283. Isoetes echinospora. A, upper part of germinating macrospore, showing 

 first cell-formation (x 300). B, section of complete gametophyte with the first 

 archegonium, or. 



the Monocotyledons. The stem is deeply divided into two or three 

 lobes, between which the numerous, dichotomously branched roots 

 are developed. 



