208 : BOTANICAL GAZETTE [MARCH 
PLATE XV. 
Fics. 33-35. Empusa culicis. X1500. 
Fic. 33. A thin, lightly stained section of the end of a conidiophore, showing 
the usual binucleate condition. 
Fic. 34. An older stage, in which the sterigma is ‘ poditins ou 
Fic. 35. From a still older preparation, in which the end : the sterigma has 
become swollen to form the binucleate conidium. 
Fics. 36, 37, Empusa americana. 1500. 
Fic. 36. A preparation in which the nucleus is poorly differentiated, but 
which ina especially clearly the vacuolar cytoplasm and the columella-like wall 
which finally abstricts the conidium. 
Fic. 37. A mature conidiospore, showing the vacuolated cytoplasm (probably 
filled vation living with oil-globules), the single nucleus, and the basal papilla 
which has been formed by the reversal of the columella. 
Fics. 38-40, Empusa muscae. X1080. 
Fic. 38. The partition-wall which cuts off the multinucleate conidium is here 
Sihirteint: The slimy enucleate protoplasm of the basal cell appears to be but 
ittle shrunken. 
IG. 39.. The end of a young conidiophore, just extruded from the body of the 
fly, in which the conidium is in process of formation, showing the multinucleate 
character of the protoplasm. : 
Fic. 40. A portion of a conidiophore still within the body of the fly, which is 
growing toward an opening in one of the abdominal joints. 
Fics. 41-44, Empusa aphidis. X1500. 
Fic. 41. A section showing at the tip of the conidiophore a young conidium in 
process of formation. | 
Fic. 42. An older stage of conidium-formation, 
Fic. 43. A mature conidium, showing the uninucleate character. 
Fic. 44. A nucleus from a conidiophore, showing two nucleoles, and portions 
of the chromatic thread. 
; Fics. 45-48, Empusa culicis. 
Fic. 45. The end of a young azygosporic hypha. 
Fic. 46. An older condition, which shows the beginning‘of the formation of a 
resting spore. X 1080, 
Fic. 47. A mature ‘“azygospore.”’ X 1080. 
Fic. 48. A thinner section of a mature eeu ”” showing but one nucleus. 
Other nuclei lie below and above in the section. X 1500 
