198 



ROLAND THAXTER ON THE 



Fig. 



296. 



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



Fig. 



297. 



A g 1 0 Up OI spoiopnoies eiiicigiiig 1 1 oni tnc mj:> t » ij\j\_iy ij i c v iuu> to tin. i u 1 1 n a i 1 un ui i jo tJ:> l'" 1 CB * v/uc 







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







mass of external zygospores. 



Figs. 298-299. 



'I'vvn i n«*t:i iipps of pxtprnal coniu <y ation. 



Fig. 



300. 



Conjugation taking place within the host. 



Figs. 301-302. 



Further examples of external conjugation. 



Figs. 





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



Fig. 



305. 



Mature resting spore. 







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



*Fig. 



306. 



A cystidium somewhat immature. 



♦Fig. 



307. 



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



*Fig. 



308. 



A digitate conidiophore arising directly from a spherical hyphal body. 



Fig. 



309. 



A hyphal body beginning to germinate. 



j? igs. 



310-317. 



Primary conidia. 



Figs. 



318-319. 



Secondary conidia of the second type. 



Fig. 



320. 



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







its point of dehiscence from the basidium. 



Fig. 



321. 



Primary conidium in which the separation from the mother-cell has become complete. 



*Fig. 



322. 



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



♦Figs. 323-325. 



Several stages in the formation of a zygospore. In fig. 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., figs. 326-315. 



♦Fig. 



327. 



Compound conidiophore. 



♦Fig. 



328. 



Rhizoids. 



Figs. 



329-342. 



Primary conidia. 



Fig. 



343. 



Primary conidia among the first discharged. 



Fig. 



344. 



Formation of a secondary conidium of the first type. 



Fig. 



345. 



Formation of a secondary conidium of the second type. 



Fig. 



346. 



Secondary conidium of second type. 







Empusa (Entomophtliora) rhizospora n. s., figs. 347—378. 



♦Fig. 



347. 



Conidiophore arising from spherical hyphal body. 



♦Fig. 



348. 



Cystidium. 



Figs. 



349-360. 



Primary conidia. 



Fig. 



361. 



Production of secondary conidium of the first type. 



Fig. 



362. 



Production of secondary conidium of the second type. 



Figs. 



363-365. 



Secondary conidia of the second type. 



Figs. 



366-367. 



Production of " pseudoconidia" from hyphal bodies resulting from the general degeneration of the co- 







nidiophores. 



Figs. 



368-369. 



Two of the pseudoconidia fully developed. 



*Fig. 



370. 



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



♦Fig. 



371. 



Spirof/yrcf-Mlie conjugation resulting in the production of a spore from both gametes. 



♦Figs. 372-373. 



Two similar points of conjugation in which the rhizoid-like enveloping processes are developing from the 







base of the spore. 



♦Fig. 



374. 



Group of mature zygospores showing indurated hyphae and rhizoid-like processes. 



Fig. 



375. 



A single zygospore. 



Fig. 



376. 



A 7.vfffwnfn'p frpprl fYnvn. flip pni<sr*nrp 



Fig. 



377. 



A '* Caddis fly" showing the growth of conidiophores. 



Fig. 



378. 



Gross appearance of the zygospores prodmcetl externally over the host. 







PLATE 21. 







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



♦Fig. 



379. 



Conidiophore. 



Fig. 



380. 



Production of secondary conidium of the first type. 



