CONTENTS. 



XVII 



SECTION 



CIX. 



ex. 



CXI. 

 CXII. 



CXIII. 



b. Obligate parasites. 



PAGE 



Facultatively saprophytic : Peronosporeae, Mucorini, Ustilagineae, Exo- 

 basidium, Myxomycetes ; strictly obligate : Peronosporeae, Erysi- 



pheae, Uredineae, &c 385 



Autoecism and metoecism 386 



Growth and extension of parasites in substance of larger plants . . 389 

 Behaviour of these parasites to separate tissues and to the parts of the 



cells of the host 392 



Reactions of the plants attacked ........ 394 



CXIV. 



cxv. 



CXVI. 



CXVII. 



Lichen-forming Fungi. 



Formation of the Lichen-thallus by the growing together of certain Algae 

 and Ascomycetes and a few Hymenomycetes which attack them. Enu- 

 meration of Lichen-forming algal forms as at present known . . 395 



First beginning of the Lichen-thallus 398 



Conformation and structure of the Lichen-thallus. Fruticose, foliaceous 

 and crustaceous forms. Distinctions in anatomical structure : 1. 

 Heteromerous thallus. 2. Graphideae and similar forms. 3. Granular 

 crustaceous thallus of Thelidium and others. 4. Coenogonium-form. 

 5. Collemaceae or Gelatinous Lichens. 6. Hymenomycetous Lichens 401 



Soredia 415 



Pseudo-lichens. — Historical remarks. Literature ..... 416 



SECOND PART. MYCETOZOA. 



CHAPTER VIII. Morphology and Course of Development. 



Myxomycetes. 



CXVI 1 1. Spores. Germination. Swarm-cells . .421 



CXIX. Plasmodia 423 



CXX. Transitory resting states. Cysts. Sclerotia 4 2 7 



CXXI. Development of sporophores and sporangia 429 



CXXII. Structure of mature sporophores and sporangia; sporophores of Cera- 



tieae ; simple sporangia ; aethalia 434 



Acrasieae. 

 CXXIII 441 



Affinities of the Mycetozoa. 

 CXXIV . . 442 



CXXV. Bursulla. 

 [4] 



Doubtful Mycetozoa. 

 Vampyrellae. Nuclearia. Plasmodiophora 



• • 



446 



