VampolsKY: Study of OU palm. 151 



in the meantime the constriction at the upper end of the haustorium 

 becomes more proiioiiiiced aiid in that région growtli around the 

 flanks goes on so that soon the diameter through the regioil is greater 

 than the diameter of the pore, offering natiiraliy, a barrier to the 

 liaustorium. Tiiis resiiHs as we shall see later in a flattened surface 

 at the attached end of the haustorium. The présence also of a coliar 

 just beneath the sheil prevents the liaustorium from pushing out of 

 the sheli. 



Growth of the embryo goes on simultaneously with growth of the 

 haustorium and at the same time at the expense of the endosperm. After 

 the embryo has pushed beyond the germ pore further external differen- 

 tiation is apparent. The portion of the embryo between the attached end 

 of the haustorium and the part containing the radicle etc., becomes the 

 neck pièce which connects the young plant with the haustorium. The 

 radicle bursts through Ihe sheath first, and occasionally the sheath has a 

 regular saw-tooth edge. In Figure Q5 the radicle has just forced its way 

 through the sheath and the sheath has been torn in the regular manner 

 described. After the émergence of the radicle the first leaf bursts through 

 at the opposite end. in (Figures 81 to 88 Plate X) the varions stages are 

 shown in succession, hi Figure 86 which is a longitudinal section through 

 a seed showing the relationship of parts, the haustorium has made consi- 

 dérable growth. The stages that follow show the further unfolding of 

 the embryo. The root System develops so that absorbtion of food from 

 the haustorium is supplemented by food taken up by the roots and the 

 food obtained by the photosynthetic processes of the green part of the 

 plant. The haustorium continues to grow at the expense of the endosperm. 

 In (Figures 92 and 94) half of the volume is now ocupied by the haus- 

 torium. In Figures 98 to 105 Plate Xi where the root Systems in the 

 several seedlings hâve made a considérable growth perhaps about half of 

 the endosperm has been used up. In a seediing with two fully unfolded 

 leaves in active assimilation, the endosperm is just about used up (Figures 

 106 and 107, Plate XII). 



The remains of the seed may be seen still atached to plants as old as 

 two years. To be sure the haustorium has degenerated and commonly a 

 root may find its way into the cavity and fill it up. 



The présence of two, three and four embryos in a seed is 

 always associated with an équivalent number of haustoria each embryo 

 emerging from a germ pore. This can be seen from Figures 98 to 105 

 Plate XI. Figures 101, 102 and 103 show the haustoria in cross 

 section. 



The original sheath of the embryo persists for a long time and even 

 in an advanced stage shown in Figure 106, Plate XII it is seen as brown 

 leathery scales at the base of the stem. 



