Sept., i92o.] OKAKVRA, ONJDA & HIQASHI:— PORPHYRA 135 



but temperature and other natural conditions being favorable, they will 

 soon develop into young fronds in the season for Porphyra. 



Explanation of Plate. III. 



Fig. 1. Carpospores of Porphyra tenera Kjellm. in amoeboid form; collected at 



Takanoshima, Tateyama, Feb. 4th, viewed Feb. 6th. Zeiss 4xD. 

 Fig. 2. Carpospores of P. tenera beginning to germinate, 2-3 days after collected at 



Kisaradu, Jan. 19th. Zeiss 4xD. 

 Fig. 3- A little advanced, with the original spore, e emptied ; sample collected at 



Kisaradu, Jan. 19th. Zeiss 4xD. 

 Fig. 4. a— c. Further advanced spores of P. tenera of the same as Fig. 3 ; a — b divided 



into two; samples collected at Kisaradu, Jan. 19th; viewed on Feb. 6th; 



hunger culture. Zeiss 4xD. 

 Fig. 5. Branching of a rhizoidal filaments; nutrition culture; sample collected at 



Kisaradu, Jan. 19th; viewed on Feb. 10th. Zeiss 4xD. 

 Fig. G. Further advanced rhizoidal filament with non-divided spore of P. tenera 



collected at Kisaradu, Jan. 19th; viewed on Feb. 6th; hunger culture. Zeiss 



4xD. 

 Fig. 7. Much more developed rhizoidal filament with non-divided spore of P. tenera; 



sample collected at Honmoku on Feb. 16th; viewed on April 3rd; contents 



omitted; nutrition culture. Zeiss 2xD. 

 Fig. 8. Carpospores of P. tenera divided into thr< e ; sample collected at Honmoku 



on Feb. 16th; viewed on March 3rd. Zeiss 4xD. 

 Fig. 9. a — c. Young frond lets developed from carpospores of P. tenera; samples 



collected at Honmoku on Feb. 16th; in a hunger culture; viewed on March 



23rd. Zeiss 4xD. 

 Fig. 10. a — d. Different stage3 of the development of carpospores of P. sub- 



orb'.cvlala Kjellm. in nutrition culture; sample collected at Takanoshima, Jan. 



30th; spores were liberated in a dish; viewed on Feb. 17th. Zeiss 4xD. 

 Fig. 11. a — b. Stunted forms of the spores same, as Fig. 10; viewed on Feb. 27th. 



Z9iss 4x1). 

 Fig. 12. a — d. Different stages of the development of carpospores of Porphyra sub- 



orbiculata Kjellm. germinated naturally on the frond of mother plant, collect- 

 ed on Jan. 30th, at Takanoshima. Zeiss 4xD 



a: atrophied cell; c: faintly colored filament. 



e: emphied cell; I: colorless portion of rhizoidal 



filament. 



