354 Wisconsin Academy of Sciences^ Arts, and Letters. 
Explanation of Figures 
All drawings were made with a camera lucida at table level. Figures 3, 4, 
5y 10, 12, 15, 23 were drawn with a Zeiss 2 mm. apochromatic oil immersion 
objective and 12 ocular (X2800) ; fig. 13 with Zeiss 2 mm. oil immersion 
objective and 18 ocular (X3600); figs. 1, 2, 8 , 9, 14, 16-22, 24-29, 35, 38 
with Zeiss 3 mm. oil immersion objective and 12 ocular (X1650). A Leitz 
oil immersion objective %0 and 4 ocular (X1600) was used with drawings 
6 , 7, 34, 36, 38, and the others, figs. 30-33, 37, 39, were drawn with a Leitz 
7 objective and ocular 5 (X665). 
Plates XII and XIII 
Fig. 1. Dichotomous branching of vegetative hyphae of TrapMna coryli 
Nishida. 
Figs. 2, 3. Uninucleate and binucleate conditions shown in cross and 
longitudinal sections of vegetative cells. 
Figs. 4, 5. Mitosis in vegetative cells. 
Figs. 6 , 7. Two nuclei are present in young aseogenous or fruiting cells. 
Figs. 8 , 9, 10, 11. Stages in the fusion of nuclei in aseogenous cells. 
Figs. 12, 13. Typical fusion nucleus in resting condition. 
Figs. 14-24. Division of the fusion nucleus: fig. 14, synapsis; fig. 15, 
longitudinally split spirem; figs. 16, 17, spirem in loops; figs. 18, 19, 20, 
thickened spirem; figs. 21, 22, equatorial plate; fig. 23, metaphase and con¬ 
striction of plasma membrane; fig. 24, anaphase. 
Fig. 25. Eeorganized nuclei; one, the primary ascus nucleus, and the 
other, the nucleus of the basal cell. 
Figs. 26, 27. Further constriction of the plasma membrane to separate 
basal cell from ascus proper. 
Fig. 28. Binucleate ascus and disintegration of the nucleus in the basal cell. 
Fig. 29. Second nuclear division of the ascus. 
Figs. 30-34. Asci containing spores. Large vacuoles surround the spores: 
fig. 32 represents the ascus in cross section. 
Fig. 35. Early stage in formation of conidia. 
Fig. 36, A, B, C, D, E, F, G. Successive stages in the budding of the 
primary ascospore showing behavior of nuclei and constriction of cell walls. 
Fig. 37. A, B, C, D, E, F, G. Successive stages in the formation of pri¬ 
mary and secondary conidia. Stages A-G represent development taking place 
in thirty minutes. Drawn as observed in living material grown on artificial 
media made from hazel leaves. 
Fig. 38. Conidia and ascospore showing that all the ascospores do not di¬ 
vide simultaneously. 
Fig. 39. Germinating conidia drawn from living material growing on the 
same media as the spores shown in fig. 37. 
