|2 ART. 14.— K. YEXDO: 



constant in equal degree as in the case of dichotomy ; and both types 

 may be found in the same individual, cf. PI. IV. fig. 2. 1. c. 



Some of the plants which belong to the section Eucorallina, and 

 might be classified near Cor. officinalis, have often numerous genicula 

 around the axial one. The writer has mentioned actual examples in 

 Cor. pilulifera and Cor. vancouveriensü, f. densa. 1) The subordinate 

 genicula belong mostly to the stalks of the conceptacles. Although 

 this arrangement of conceptacles characterises the plant in some 

 measure, in considering the position of the genicula, the whorly 

 genicula in this species would better be treated as of less importance. 

 It should not be forgotten, however, that the origin of these whorly 

 genicula is entirely different from those of Amp. stelligera, etc. 



B. Abnormal Position. 



As has been already remarked in the preceeding chapter, every 

 geniculum accompanies an articulus, whether it be of branch, pinnule 

 or stem. Hence the abnormal position of a geniculum means a 

 geniculum belonging to an abnormal branch or branchlet. The most 

 common case of such abnormity is found on the flat surface or margin 

 of an articulus. Illustrious examples have been given in Amp. 

 aberrant and Amp. canaliculata. 3) In these species the branchlets 

 consisting 1 of one or more articuli originate on the surface or the 

 margins of the articuli. In most cases the form of branches and the 

 shape of the articuli of these abnormal ramules are much modified. 

 To give the minor points of these modifications is, at present, not 

 necessary. These abnormal branches have the genicula directly on 

 the surface of the articuli. Very often, in the case of Amp. aberranSj 



1). Cor. verse of Port Renfrew. PI. LYI. fig. 17: Cor. verœ Japon. PI. III. fig. 16. 



2). Cor. vera; Japon. PI. II. fig. 1-2. 



S). Martens : Preus. Exp. nach Ostas. Tange. PI. VI. 



