2S4 



PLANT STUDIES 



nected together, so tluit a myceliuiu beariug uredospores is 

 called a Uredu, one bearing telentosjiores a I'lirriiiia, and 

 one bearing secidia 'dn ^Ecid in 11/ ; but what forms of Vrcilo, 

 ritfi-iiiid, and ^Ecidiuin belong together in the same life 

 cycle is very difficult to discover. 



Another life cycle which has been discovered is in con- 

 nection with the " ci'dar apples " which appear on red 

 cedar (Fig. 354). In the spi'ing these diseased growths Ijc- 

 conie conspicuous, especially after a rain, wlien the jelly- 

 like masses containing the orange-colored spores swell. 

 This corresponds to the phase which jiroduces rust in 

 wheat. On the leaves of apjde trees, wild ci'alj, hawthorn, 

 etc., the a3cidium stage of the same jjarasite doveloi^s. 



4. Basidiomycetes (B(if<iiUtaii-Fiiii(/i). 



18i). General characters. — This group includes the mush- 

 rooms, toadstools, and jjuffballs. They arc not destructive 



parasites, as are many 

 forms in the ])rcccding 

 ■■ A ' groups, but mostly harm- 



less and often useful sap- 

 rophytes. They must 

 also be regarded as the 

 most highly organized of 

 the Fungi. Tlie popular 

 distinction between toad- 

 stools and mushrooms is 

 not borne out b_y botan- 

 ical characters, toadstool 

 and mushroom 1 icing the 

 sa,me thing liotanically, 

 and forming one grou]i, 

 puffballs forming an- 

 other. 



■ic '•", Thr r.iiiiriHiii rdiiiir nni-inoni As in ^Ecidiomycctcs, 



,i</«/7(«,sc»w/y.*7/;.v -Afur (iiii.-.iN uo scxual proccss has 



