526 GLOSSARY 



Versatile, said of an anther attached by one face to the end of the filament 



where it swings loosely, 158. 



Volva, a veil entirely enveloping the young fruit bodies of certain mush- 

 rooms, as in Amanita, etc., 325. 

 Xerophytes (Xer'-o-phytes), plants with structures enabling them to live 



under severe conditions of dryness, 456, 457, 460. 

 Xerophytic (Xer-o-phyt'-ic), having the character of xerophyte plants, 457, 



460. 



Xylem, the wood portion of the fibrovascular bundle, 36, 63, 64. 

 Xylogen, wood or xylem in formation, same as lignin, 140. 

 Zoogonidium (Zo-o-go-nid'-i-um, plural, zoogonidia), same as asexual 



zoospore, 242, 243. 

 Zoospore (Zo'-6-spore), literally an animal spore, in botany applied to 



motile spores provided with slender protoplasmic lashes, or cilia; 



swimming spore, 241-243. 

 Zygospore (Zy'-go-spore), the spore (usually a resting spore), resulting 



from the union of two gametes, or sexual cells, alike or nearly alike in 



size, 236-238, 240-243. 

 Zygote (Zy'-gote), the fertilized egg, whether a zygospore or oospore, 237, 



2 3 8 355> 37 2 , 4o6. 



