x CONTENTS 



8. SPORE DISSEMINATION 166 



Distribution of spores, 167. Structural adaptations for 

 expulsion of spores, 179. Hygroscopic mechanism in 

 Myxomycetes, 179. Spore expulsion among Phycomv- 

 cetes, 180. Spore discharge among Ascomycetes, 186. 

 Spore discharge among Basidiomvcetes, 194. Implica- 

 tions, 205. 



9. GERMINATION OF SPORES 210 



Germination types, 210. Methods of testing spore ger- 

 mination, 212. Hereditary factors and germination, 214. 

 Water relations affecting germination, 218. Effects of 

 temperature on germination, 221. Influence of reaction 

 on (termination, 229. Influence of oxygen on germina- 

 tion, 230. Influence of carbon dioxide on germination, 

 231. Influence of light on germination, 231. Influence 

 of nutrition on germination, 232. Resume, 232. 



10. HOST PENETRATION 236 



Direct penetration, 237. Stomatal penetration, 248. Pene- 

 tration through wounds, 251. Haustoria and their sig- 

 nificance, 252. Penetration by ectoparasites, 253. Im- 

 plications, 254. 



11. PHYSIOLOGIC SPECIALIZATION AND VARIATION 



AMONG FUNGI 257 



12. ASSOCIATIVE EFFECTS AMONG FUNGI 279 



Antagonism, 280. Stimulation by associative interaction, 

 287. General considerations, 292. 



13. MYCORRHIZAE AND MYCOTROPHY 297 



14. GENETICS OF FUNGI 317 



Sexual and asexual stages of fungi, 317. Homothallism 

 and heterothallism, 319. Dominance and lethal factors, 

 335. Resume, 336. 



15. POISONOUS AND EDIBLE FUNGI 339 



Poisonous fleshy fungi, 339. Food value of fleshy fungi, 

 351. Ergot and ergotism, 354. Toxicity of Gibber ella 



