354 
Faull . — The Cytology of 
of the inner wall, which is just beginning to form, is shown at the left. The carpogonium and 
trichophoric cell of the procarp occupy the axis of the perithecium. x 600. 
Fig. 23. A slightly older stage. The inner wall of perithecium is now well on the way. x 600. 
Fig. 24. A still older stage, although the inner wall of perithecium is not as far developed as 
in Fig. 23. The nucleus of the carpogonium appears to have divided into two, and the septum 
between the carpogonium and trichophoric cell is no longer visible, x 1,350. 
Fig. 25. A later stage, in which the trichophoric nucleus is seen in the act of dividing, x 600. 
Fig. 26. A later stage, x 600. 
Fig. 27. An older procarp. The cells in order from the top down are, trichophoric cell, superior 
supporting cell, carpogonium, and inferior supporting cell, x 450. 
Fig. 28. From the bottom up are the inferior supporting cell, secondary inferior supporting cell, 
ascogenic cells, superior supporting cell, and trichophoric cell. (Drawn from two sections.) x 600. 
Fig. 29. In the axis are to be seen an ascogenic cell, secondary inferior supporting cell, and the 
remains of inferior supporting cell, x 600. 
Fig. 30. Upper end of a young procarp, at the stage represented in Fig. 22, showing tricho- 
phoric cell and trichogyne. x 450. 
Fig. 31. A combination of Figs. 22 and 30, with the trichogyne restored from other sections of 
same series, and hence in part conventional. x 450. 
Fig. 32. An older stage than in Fig. 28. The young asci have begun to grow out. In the 
axis, from the upper part down, are the trichophoric cell, superior supporting cell, two asci, two 
ascogenic cells, secondary inferior supporting cell, and inferior supporting cell. Partly conventional, 
x 600. 
Figs. 33-6 are transverse views of the same young fruiting organ taken at successively lower 
levels, and designed to show the position of the procarp and the relation of the two perithecial 
walls to one another, x 450. 
Fig. 37. An ascogenic cell in which the nuclei are dividing, and an ascus in which the nuclei 
have not yet fused, x 2,700. 
Fig. 38. An ascogenic cell and four of its asci. x 1,800. 
Fig* 39* Nucleus of a spore in metaphase stage, x 2,700. 
Fig. 40. Photograph of anal plate of host with two attached Laboulbenia chaetophora. 
PLATE XXXIX. 
Fig. 41. Two ascogenous cells with asci, as seen in a single section. The collapsed walls of 
asci from which the spores have been shed appear in the middle, x 1,350. 
Fig. 42. Two young asci. x 1,800. 
Fig. 43. A young ascus. The nuclei have not yet fused, x 2,700. 
Fig. 44. A young ascus, the nuclei fusing, x 2,700. 
Fig. 45. An ascus with young fusion nucleus, x 2,700. 
Fig. 46. Part of ascus, showing fusion nucleus in synapsis, x 2,700. 
Fig. 47. Fusion nucleus with what appear to be paired chromatin threads, x 2,700. 
Fig. 48. A similar, but somewhat later stage, x 2,700. 
Figs. 49 and 49 a. The same nucleus from two sections, showing the secondarily contracted 
chromatin, x 2,700. 
Fig. 50. The fusion nucleus with its four chromosomes standing in relation to the central body, 
but as yet no spindle has been formed, x 2,700. 
Fig. 51. The first spindle with central and mantle fibres and three of the four chromosomes, 
x 1,800. 
Fig. 52. The first spindle with two chromosomes, the right of which at least appears .to have 
broken into two parts, x 2,700. 
Fig* 53* The first spindle, anaphase stage, x 2,700. 
PLATE XL. 
Fig. 54. The first spindle, a later stage. Only the central fibres have persisted. There are 
indications of vacuolar cavities marking the beginnings of the daughter nuclei, x 1,800. 
Fig. 55. One of the two daughter nuclei in division, x 2,700. 
