The Germination and Development of 

 Some Marine Algae. I. 



By 



Kichisjiburo Yendo. 



{IV'ith Plate 1 and 2 Text/igures) 



Our knowledge on the development and life-history of algae 

 has been greatly enriched since the end of last century. Yet, 

 the number of species and genera actually studied on these lines 

 is comparatively small. 



There is a considerable number of marine algae which 

 make their appearance at a certain season of the year and cease 

 to exist during the rest. These are known among botanists 

 under the name of " annual marine algae." The state in which 

 they remain during their resting period we know nothing about. 

 The behaviour of the spores of the epiph3'tic and endophytic 

 algae which live at the expense of the " annual algae " appears 

 to me almost a riddle. 



When we closely studj' the so-called " perennial " marine 

 algae, we find here also that the term is in most cases errone- 

 ously applied. Most of them exist for not longer than two 

 years. There is a certain interval after the\^ are entirely up- 

 rooted after fructification until they reappear as sporelings. 

 Where and in what state are the spores duiing the interval ? 



What is assumed or believed relating to the non-appearing 

 stage of such algae is, so to speak, mere traditional. In many 

 marine algae, the spores are known to germinate soon after 

 they are liberated from the frond^\ But really the continuous 

 vegetation of the algae is not met with in the field. 1"' have 



1) Cfr. Works by Tiiuret, Eeinice, Sauvageau, etc. 



2J Yenuu ; Development of Costakia, Undarxa and Laminakia, [>. 694. 



