198 EOLAND THAXTER ON THE 



A zygospore wliich seems to have resulted from a double conjugation. 



A group of sporopliores emerging from the host's body previous to the formation of zygospores. One of 



their number has grown beyond the rest and subsequently forms part of a network which holds the 



mass of external zygospores. 

 Two instances of external conjugation. 

 Conjugation talking place within the ho.st. 

 Further examples of external conjugation. 



Besting spores formed internally, the process of conjugation not visible. 

 Mature resting spore. 



Empusa (Entomophthora) sepulchralis n. s., figs. 306-326. 

 A cystidinm somewhat immature. 



The terminal portion of a cystidium at a more advanced stage. 

 A digitate conidiophore arising directly from a spherical hypbal body. 

 A hyphal body beginning to germinate. 

 Primary conidia. 



Secondary conidia of the second type. 

 Primary conidiura in which the mother-cell wall has separated from the spore, remaining attached only at 



its point of dehiscence from the basidium. 

 Primary conidiura in which the separation from the roother-cell has become complete. 

 Conjugation of two hyphae and first budding of the zygospore from one of the gametes. 

 Several stages in the formation of a zygospore. In flg. 325 the whole contents of the conjugating cells 



have passed into the zygospore. 

 Fig. 326. Mature zygospore. (The circles of dots are due to careless engraving). 



PLATE 20. 



Empusa (Entomophtliora) variabilis n. s., tigs. 326-345. 

 Compound conidiophore. 

 Rhizoids. 

 Primary conidia. 



Primary conidia among the first dtschargecF. 

 Formation of a secondary conidium of the first type. 

 Formation of a secondary conidium of the second type. 

 Secondary conidium of second type. 



Empusa (Entomophthora) rhizospora n, s., figs. 347-378. 

 Conidiophore arising from spherical kyphal body. 

 Cystidiom. 

 Primary conidia. 



Production of secondary conidium of the first type. 

 Production of secondary conidium of the second type. 

 Secondary conidia of the second type. 

 Production of " pseudocoaidia" from hypbal bodies resulting from the general degeneration of the co- 



nidiophores. 

 Two of the pseudoconidja fuHy developed. 



Formation of a zygospore by the conjugation of thre free ends of two hyphae. 

 Spirogyra-Wiiii conjugation resulting in the production of a spore from both gametes. 

 Two similar points of conjugation in which the riiizold-llke enveloping processes are developing from the 



base of the spore. 

 Group of matnre zygospores showing indurated byphae and rhizoid-like processes. 

 A single zygospore. 

 A zygospore freed from the epispore. 

 A " Caddis fly" showing the growth of conidiophores. 

 Gross appearance of the zygospores produced ex;ternally over the host. 



PLATE 21. 

 Empusa (Entomophthora) gracilis n. s., figs. 379-391. 

 *Fig. 379. Conidiophore. 



Fig. 380. Production of secondary conidium of the first type. 



