Laboulbenia chaetophora and L. Gyrinidarum. 
n r -> 
03 J 
Wager, H. (’93) : On Nuclear Division in the Hymenomycetes. Ann. Bot., vii. 
Wahrlich, M. (’92) : Zur Anatomie der Zelle bei Pilzen und Fadenalgen. St. Petersburg. 
(Russian.) 
Welsford, E. J. (’07) : Fertilization in Ascobclus furfuraceus , Pers. The New Phytologist, vi. 
Woronin, M. (’00) : Uber Sclerotinia cinerea und Sclerotinia fructigena. Memoires de l’Academie 
Imperiale des Sciences de Saint-Petersbourg, Classe physico-math^matique, x, No. 5. 
DESCRIPTION OF FIGURES IN PLATES XXXVII-XL. 
Illustrating Professor Faull’s paper on the Cytology of Laboulbenia. 
PLATE XXXVII. 
Fig. 1. Part of appendages of a mature plant of Laboulbenia chaetophora . All of the septa 
except the two uppermost are represented in section. The two in black illustrate the septa as they 
ordinarily appear, because of the fact that the wall at the periphery of the septum is opaque black in 
nature and so obscures the inner details, x 2,700. 
Fig. 2. The apical cell of an appendage, x 2,700. 
Fig. 2 a. An ordinary septum from an appendage as seen in face view. The black line repre- 
sents the peripheral black chitinous wall substance, and the opening in the centre the single 1 pore ’ 
or ‘pit’, x 2,700. 
Figs. 3-6. Portions of cells from various parts of the main body of the mature plant, showing 
the structure of the protoplasm with granular inclusions as it appears in sections. Fig. 3 is from one 
of the lower and larger cells, x 2,000. 
Fig. 7. The ordinary type of pit in the main body of plant. Hyaline cytoplasm and intensely 
staining granules occupy the depressions. The middle lamella is very finely perforated, if at all. 
x 1,350. 
Fig. 8. A very exceptional instance of a wide open pore from the lower part of receptacle, 
x 1,350. 
Fig. 9. A section of outer wall of a young plant, showing the chitinous covering, the fibrous 
layer in course of differentiation (the unstippled bars are the unchanged wall substance that later 
constitutes the fibrils), and the inner laminae streaked here and there by fine dark threads, x 2,700. 
Fig. 10. A later stage, showing the fibrils, x 2,700. 
Fig. 11. A part of the chitin torn away by the knife and to which several fibrils are attached, 
x 2,700. 
Fig. 12. A bit of the outer wall, comprising the chitinous covering and the fibrous layer, shown 
in three dimensions. The porous appearance of the chitinous covering is due to underlying trans- 
parent fibrils, x 2,700. 
Fig. 13. The surface of the fibrous layer immediately in contact with the chitin. x 1,800. 
Fig. 14. A bit of the fibrous layer in an early stage of differentiation shown in three dimensions. 
The portions not stippled are unmodified parts of the layer which later give rise to the fibrils, x 1,800. 
Fig. 15. From uninucleate stage of spore ; the nucleus in division, x 2,700. 
Figs. 16-18. Stages immediately following Fig. 15. In Fig. 18 the septum is complete. 
X 2,700. 
Fig. 19. A multinucleate cell from the receptacle of a mature and probably old plant, x 900. 
Fig. 20. A portion of thallus, showing pits in walls and cytoplasmic fibrils, x 1,800. 
PLATE XXXVIII. 
Fig. 21. Part of young thallus. Uppermost cell is the initial of the procarp. The cells just 
below give rise to wall of perithecium. x 600. 
Fig. 22. Section through a young plant. The outer wall of perithecium is complete ; one cell 
