Conopholis americana. 19 



crermination. The resemblance in this respect is not to 



to 



members of the OrobanchccB, but exactly to the Bala7iophore(2 

 and RafflcsiacetB. 



5. The irritant action of the parasite causes swelling up of 

 the host root, and enormous multiplication of its sclerenchyma 



patches. 



6. Each parasitic " tubercle " consists of a bark, scleren- 

 chyma masses and possibly some cellular tissue belonging to 

 the host, and of cellular tissue and bundle issue, chiefly 

 developed in the flower stalks of the parasite. 



7. The flowering shoots show two concentric rows of bundles. 



8. The phloem masses of the bundles face each other. 



9. Stomata are present over the flowering shoots, but absent 

 from the leaves. 



10. The leaves are brownish-leathery when mature, and are 

 devoid of palisade tissue. 



11. In cells of the leaves and young flowering shoots are 

 numerous clear refractive bodies which may be of a glucoside 

 character. 



12. The flowers show a small ovarian nectar gland 



EXPLANATION OF PLATES I-VI. 



Plate I. Three growths of Conopholis, on oak root, one-half natural size. 

 Plate II. Longitudinal section of Conopholis and oak root. 

 Plate III. Longitudinal section of Conopholis and oak root, opposite half 

 to that figured in Plate II. 



Plate IV, Figs. 1-4. Longitudinal sections of young flower shoots on oak 



tissue. 



Plate V, Figs. I and 3. Transverse section of flower shoot of Conopholis, 

 Fi<y. I X 30°> Fig. 3 X 5°°- F'g- 2- Portion of stem showing double circle of 

 vascular bundles, X 75 °- Fig. 4. Single bundle, X 35°° • Fig- 5- longitudinal 

 section of flower bud from young plant of Conopholis. 



Plate VI, Figs. I-4. Young plants of Conopholis attached to oak roots, 

 natural size. Fig. 5. Patch of sclerenchyma cells from parasitic swelling. Fig. 

 6. Cells from epidermis of leaf of Conopholis. 



