アサクサノリの生活史に就いて,特に秋に立込んだヒビに最初に着く胞子の性質-III

Abstract

“Autumn spores” of Porphyra tenera fix themselves to collectors early in autumn and give rise to winter plants. In previous papers, it was shown that the autumn spores in Tokyo and Ise Bay measure about 11μ in diameter and are not to be considered as monospores (14-15μ in diameter) from “summer plantlets”. In this paper the auther reported some results of the measurement of the spores from Concho-celis-phase of Porphyra tenera cultured in oyster shells and his view upon the life-history of Porphyra. The spores measure about 11μ in diameter; they develop to Porphyra thalli. Autumn spores in Tokyo and Ise Bay at least a greater part of them, are concluded with reasons to be the spores from Conchocelis-phase. In the previous papers, which appeared at the time when the spores Conchocelis phase had not been discoverd, author suggested that carpospores formed in previous winter might pass the summer in a resting state and directly become autumn spores in autumn. This suggestion should be now withdrawn.