272 



INDEX AND GLOSSARY 



bordering or surrounding an organ; the 



lateral petal of a papilionaceous corolla. 

 Wood, annual layers, 224 ; structure of, 48, 



219. 

 Woolly. Clothed with long tortuous or 



matted hairs. 



Xerophytes, 65. 

 Xylene, 222. 



Teast, 160. 

 Yeasts, 185. 



Zoosporangia, 178. 

 Zoosporangium, 189. 

 Zoospores, 172, 175, 179, 189. 

 Zygomorphic, 129. 



Zygospores, 172, 174, 188; of Sporodinia, 

 '257. 



