2G ART. 14— K. YENDO: 



of the geniculum. This phenomenon, of coarse, undergoes mach 

 fluctuation according to the condition of the genicula. 



In Amp. aspergillum we hnd the lower half of the filamentous 

 cells stained much deeper with hematoxylin than the surrounding 

 regions. The upper zones, that is, the layer of the elliptical cells at 

 the upper end of an articulus, stain in the same degree as the upper 

 half of the filamentous cells. The elliptical cells have cellular con- 

 nections at the distal ends and at the periclinal sides ; and the 

 transverse communication between the filamentous cells is confined to 

 the uppermost part of the periclinal side. 



Formation and development of the Geniculum. 



The formation of the geniculum takes place at an early period of 

 the development of the frond. The first geniculum is already 

 perceivable when the process of the frond lias reached 1 mm. above 

 the incrustation. As the frond grows higher, a ereniculum is formed 

 just below the apex of the frond. 



The apical growth of the Corallinœ depends upon the division of 

 the cell layer which covers the apex of the frond. 2) 



As far as the writer could observe, the genicular cells are not 

 directly formed from the layer of the growth. The search for the 

 youngest geniculum directly under that layer ended without success ; 

 but it was found always at a distance from the apical point. Several 

 zones of the periclinal cells are generally found lying between the 

 new geniculum and the apex. In the case of multizonal genicula 

 this i< especially the case, and in hair-like Jania the genicula are close 

 to the apex. 



1). Hkydrich : 1. c. p. 7'J. Taf. 1 1, fig. 26. 



Y ENDO : Cor. verœ Japon. PI. II. ßg. .",. 

 2). S0LM8: 1. c. p. 29. 



Kny : Ueber ochte u. falsehediehot unie im l'n mzenreich. 





