1 1 8 Peirce. — Physiology of the Genus Cuscuta. 
EXPLANATION OF FIGURES IN PLATE VIII. 
Illustrating Mr. Peirce’s paper on Cuscuta. (Tissues of parasite red.) 
Fig. i. Part of petiole of Solatium jasminoides on which are scattered flower- 
clusters of a Cuscuta , the intermediate portions of the stem having atrophied and 
disappeared. Natural size. 
Fig. 2. Outline of cross-section of petiole in Fig. i, through line a-b , between 
two flower-clusters, e, epidermis ; c, cortical parenchyma ; b , phloem ; x, xylem ; 
s', sclerenchyma-mass ; s , area in which are scattered sclerenchyma-masses ; 
p , pith-parenchyma ; /, bundle to leaflet ; H, imbedded abortive haustorium. 
X 12. 
Fig. 3* Outline of cross-section of petiole in Fig. i, through line c-d, through 
a flower-cluster and one of its haustoria, e, c, &c., as above ; except p, where paren- 
chyma-cells have divided, become thicker-walled and lignified, under pressure. 
X 12. 
Fig. 4. Cross-section of leaf of Zea Mais ( b ) showing pressure exerted by grow- 
ing haustorium of C. glomerata {a) ; c-d , epidermis of upper (inner) side of leaf, 
x 120. 
Fig. 5. Showing penetration by pressure of the growing haustorium of overlying 
cells through sheet of tin-foil : a-b , sheet of foil in cross-section : C. glomerata. 
x 120. 
Fig. 6. Starch-grains of Hordeum corroded by cells of pre-haustorium of 
C. glomerata. x 490. 
Fig. 7. Cross-section of elder- pith showing solution of its cell-walls by ‘ cushion - 
cells’ of C. europaea. X490. 
Fig. 8. Cortical parenchyma of petiole of Impatiens Balsamina, in which wall 
of haustorial cell of C. glomerata has partly dissolved, bent, and is fused with wall 
of cortical parenchyma- cell, x 360. 
Fig. 9. Showing penetration into cavity of parenchyma-cell by solution accom- 
plished by haustorial cell, whose wall at a and b has fused with wall of parenchyma- 
cell. x 360. 
