10 AßT. 14.— K. YENDO: 



cells of u certain portion of an articulus. The difference of the level 

 from which the genicnla start illustrates the fact that they are of 

 separate origin. Hence at least in the last mentioned species the 

 genicnla of the ramuli or the pinnules are not genetically related to 

 those of the neighbouring axial articulus. It should be admitted 

 that the pinniferous articulus might be taken conveniently as a 

 sas;ittated one with the shoulders enormouslv prolonged and finally 

 jointed. 



Amp. stdligera and Amp. Gharoides, as well as their allied forms, 

 have a peculiar mode of ramification. This has been already remarked 

 by KÜTZING in his Tab. Phyc. vol. VIII. p. 26. The branches never 



start like all other members of the Comllinœ directly from an articulus. 

 The primary geniculum of a ramus or ramulet always starts from a 

 certain limited part of the axial geniculum, and not from an articulus. 

 The whorly branchlets of these species, therefore, have quite a distinct 

 morphological significance from those of Cor. pilulifera, Cor. vancouverien- 

 sis, etc. which are mentioned below. Hence in the former spscies the 

 branchlets are practically developed at the expense of the axial 

 geniculum. I was not able satisfactorily to trace the origin of the 

 branchlets, as the material would not allow me to do so ; but it was 

 clearly observed that the embryonal stage of the branchlets is readily 

 recognizable around the immature axial geniculum. How the genicula 

 could give out branchlets will be noticed hereafter. 



The genicula of the pinnated and the whorly fronds are always 

 at certain angles to one another. The angles between the o-enicula 

 of the axis and the pinnules are geometrically adjacent angles to the 

 angle formed by the axial articulus and the pinnules. Here the 

 angle between the genicnla means that which has been formed by 

 the planes perpendicular to the periclinal axes of the axial articulus 

 and the pinnules concerned. 



