Arr,Ax Papavehis Pkiîiîis 



149 



ei)i(lerinis of tlie septa is doubled. Also the ])<u'Oii(*liym of the septa 

 gets more protoplasma at the side where the larvae lie . the cells 

 divide and so the septa grows thieker. 



The ovnlae themselves alter in the following manner. The cells 

 of the funiculus grow and divide and the whole funiculus changes 

 into a thick stalk, whicli passes iui]>ercei»til)ly int<> the l)ase of the 

 ovula. Of the latter only the integuments exiniiul. Tliey get more 

 celllayers, esjiecially at their hase. The nucellus-tissue and the em- 

 bryosack (Ui the contrary lose their noiiual form. They are shrivelled 

 to an irregular mass, aiul are i)u- 

 slied to the top by the augmented 

 growth of the lower pints. The 

 micropyle wideiis, the integuments 

 divide there, so that this mass lies 

 free towards the outside (Fig. .'5). 

 As MOLLIAKD described and 

 what he calls the sec(md i)hase of 

 the gall - development, the septa 

 swell more and nu»re and aftei' so- 

 uu' time fill the room between theui 

 and reacli each other. Where they 

 touch the outer cells fiatten and 

 the whole grows into one, except 

 near the places, where the larvae 

 lie. Round each of these a space 

 is left open , which is to be the 

 larval chand)er. It takes a long' 

 time before these get quite closed, 

 the septa cmly growing togetlier 

 in the outer parts first leaving a large room in the centre, which is 

 more spacious than in the beginning , as the circumference of the 

 young fruit has increased in breadth. At last also the tops of the 

 septa come together and fuse. 



The seeds take some part in this. First it sliould be observed 

 that the young larvae feed on them. They eat away the tops of them, 

 i. e. the integuments and sometimes only the funiculi are left. These 

 then form escrescences on the se]>ta , but when the latter grow to- 

 gether they are no more to be recognised. Only in some cases, when 



Fii^'. 8. — Loiijiitudiual section of an ovnk' 

 in a yoime gall. Tlie uucellns-tis- 

 siui and the embryosac is destroyed. 

 X 300. 



