CONTENTS. 



XVII 



b. Obligate parasites. 

 SECTION PAGE 



CIX. Facultatively saprophytic : Peronosporeae, Mucorini, Ustilagineae, Exo- 

 basidium, Myxomycetes ; strictly obligate : Peronosporeae, Erysi- 



pheae, Uredineae, &c. . . . 385 



CX. Autoecism and metoecism . , 386 



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

 CXI I. Behaviour of these parasites to separate tissues and to the parts of the 



cells of the host . . . ,' . , . . . . . 392 

 CXI II. Reactions of the plants attacked . 394 



Lichen-forming Fungi. 



CXIV. 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 



CXV. First beginning of the Lichen-thallus 398 



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

 and crustaceous forms. Distinctions in anatomical structure : I. 

 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 



CXVII. Soredia . 415 



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



SECOND PART. MYCETOZOA. 



CHAPTER VIII. MORPHOLOGY AND COURSE OF DEVELOPMENT. 



Hyxomycetes. 



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



CXIX. Plasmodia 423 



CXX. Transitory resting states. Cysts. Sclerotia 427 



CXXI. Development of sporophores and sporangia ...... 429 



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



tieae ; simple sporangia ; aethalia 434 



Acrasieae. 



CXXIII. 



CXX IV. 



Affinities of the Mycetozoa. 



Doubtful Mycetozoa. 



CXXV. Bursulla. Vampyrellae. Nuclearia. Plasmodiophora 

 [4] b 



441 



442 



. 446 



