656 THE LIFE HISTORY OF LORANTHUS EXOCARPI BEHR. 



The production of two or more sinkers from the attachment- 

 disc, which takes place when the inner portion of the disc 

 becomes wedged in a forked branch, is represented in Plate xviii., 

 % 7. 



Young plants of Loranthus Exocarpi are at first erect, but, as 

 the plant increases in size and weight, the branch is twisted, the 

 Loranth becoming pendulous (Pl.xx., fig.4). 



EXPLANATION OF PLATES XV. -XX. 



Plate xv. 

 Figs.1-27. — Seeds of Loranthus Exocarpi Behr, in various stages of growth 



and sections of some. 

 Fig. 28.— Attachment- disc and cleft through which the sinker reaches the 



branch of the host. 

 Fig. 29. — Section through attachment-disc, parallel to the cleft, showing 



sinker. 

 Fig. 30. — Seed producing two radicles. 



Plate xvi. 

 Fig.l. — Young plant of Loranthus Exocarpi on Casuarina quadrivalvis. 



The sinker has penetrated the annual rings and medullary rays. 

 Figs. 2-3.— Sinker through the centre of twigs. 



Plate xvii. 

 Fig.l. — Same as fig. 1 of previous plate. 



Fig. 2. — Section through attachment-disc and portion of Prunus branch, 

 sinker passing through and held in position by the lips of the cleft. 



Plate xviii. 

 Figs. 1, 2 and 4. — Various types of graft with Casuarina quadrivalvis. 

 Fig. 3. — Loranthus Exocarpi on Loranthus pcndulus. 

 Fig. 5. — Microscopic section from base of Loranthus Exocarpi. Cells 



crammed with starch grains, iodine-stained. 

 Fig.6.— -Micro, section of junction of Loranth and host-plant, showing starch, 



iodine-stained. 

 Fig. 7. — Attachment-disc developing two sinkers. 



Plate xix. 

 Figs. 1-6. — Acacia melanoxylon, showing grafts not penetrating medullary 

 rays and method of formation. [Fig.6 is erroneously lettered 7]. 



Plate xx. 

 Figs. 1-4. — Life-history, from the germinating seed to one year old seedling. 



