214 



THE BOTANICAL MAGAZINE. 



LVol, XXXV. No. 419. 



On the one hand, Porphyra is allied to Florideje by having 

 sexual cells and the chromatophore which contains phycoerythrin, 

 and it especially shows a close relationship to the lower members of 

 Nemalionales in the presence of pyrenoid and in the absence of alter- 

 nation of generation, i.e. no tetrasporic plant is present, as the 

 reduction division takes place soon after the fertilisation. On the 

 other, the direct production of carpospores from the earpogonium, 

 the presence of a kind of incipient nucleus and the absence of the 

 protoplasmic continuity are the special characters of Porphyra dist- 

 inguishing the latter from Floridae. 



As to the distribution of phycoerythrin and phycocyanin in 

 Cvanophyceee and Rhodophyceee, the recent investigation has arrived 

 at an interesting result which is summarised in the table* in 

 the next page. 



As the table indicates, the fact, that the two sorts of pigments 

 are more widely distributed in the two groups than it was formerly 

 supposed, serves to show an intimate relationship existing between 

 the red and blue-green algae, though in the majority of them one of 

 the pigments is absent. 



Ulva which was supposed by Schmitz (10) and Oltmanns (9) 

 to have a close afhnity to Bangiales, has a highly dfFerentiated 

 nucleus and the chromatophore of a type differing from that of 



Bangiales as shown in the Text-fig. 

 14. Moreover it produces plano- 

 gamcte and zoospore, which rad- 

 ically differ from the reproductive 

 elements of Porphyra. Though the 

 pigments of Ulva has not yet been 

 fidly studied, any relation with 

 Porphyra does not seem to exist. 



A striking resemblance between 

 Coleocha^te and lower members of 

 Nemalionales has repeatedly dis- 

 cussed by many investigators who 

 generall}' agree in the point that a 

 phylogenetic relation does exist bet- 

 ween them ; but the difference of 





X ^roo 



Text-tig. 14. 



Ulva sp. 



a. Nucleus in resting state. 



b. Nucleus in prophase, two chro- 



mosmes are differentiated. 



* I am much indebted to Prof. K. Shibata for his kind help in collecting 

 records for the table. 



