1906] OLIVE—DEVELOPMENT OF EMPUSA 207 
Fics. 12-21, Empusa sciarae. 
Fic. 12. A section showing two cells of the old vegetative mycelium, or “hyphal 
bodies,” from the upper one of which has grown out radially a conidiophore.. 
Fic. 13. A hyphal segment freshly killed with acetic methyl green. X 480. 
Fic. 14. The same, showing the beginning of a conidiophore. X 480. 
Fic. 15. The same, showing a still longer conidiophore. 4 
Fic. 16. Section of a radial conidiophore which is just ees > deca the epi- 
dermis of the host, showing the subterminal branching. x1 
Fic. 17. Section of a conidiophore showing a palsy ERS between the 
two cells. 1080. 
IG. 18. A half-completed stage of cell-division in a conidiophore. X 1080. 
Fic. 19. Cell-division in the vegetative mycelium. 00. 
IG. 20. An almost-completed stage of cell-division in a conidiophore; the iron- 
haematoxylin stain has been almost completely washed out of the preparation, 
except at the innermost margin of the cleft. x 1500. 
Fic. 21. A poorly differentiated construction in a vegetative hypha. 
Fics. 22-24, Empusa sp. ? 
Fic. 22. Section of a conidiophore, showing the peculiar method of the cutting 
off of eee cells, which apparently soon die. x1 
- 23. Section of a conidiophore showing a subterminal branch, and also 
be hae appear to have assumed amoeboid shapes. X 1 
Fic. 24. A similar section to that shown in fig. 22, but with aly one basal cell 
cut off. * 1080. 
Fics. 25, 26, Empusa sp. 
Fic. 25. End of a conidiophore, from which has been cut off two uninucleate 
segments. X 1080 
Fic. 26. A re which is apparently being pushed out of the thick, slimy 
wall of the mother hypha. 575. 
Fics. 27-29, Empusa sciarae. 
Fic. 27. A section showing two protruded terminal cells of the conidiophore, 
from which young conidia are in process of formation. x1 
Fic. 28. A section of a conidium in process of shetrintion, 7 in which the iron- 
haematoxylin stain has not differentiated the nucleus aay has brought out some 
of the metachromatic bodies. X 1500. 
Fic. 29. A mature conidium. 
Fics. 30-32, Empusa culicis. 1500. 
G. 30. The upper portion of the terminal cell of a conidiophore, showing at 
sigs side the cleft marking the ring-formed cleavage-furrow. 
Fic. 31. A section showing a somewhat older stage, in which the cleft has 
almost abstricted the binucleate conidium 
Fic. 32. A rare occurrence, showing a ‘pontiac conidium. 
