Abstract
In the Nori (laver) field of Tokushima city, a laver of extremely narrow shape is found mixed with the common laver, Porphyra tenera. Early development of the laver discussed here was investigated during 1951-52. The results are as follows. 1) The laver appears in the same season and also in the same level as Porphyra tenera. 2) The sporelings of the laver develop into long filaments of a single row of cells. Longitudinal cell-division occurs when the sporelings have developed to about 500-celled stage, while in other Porphyra species it occurs when the sporelings are in younger stages than 50-celled one. 3) The relation between the thickness (W in μ) and the number of cells (n) in the sporelings is shown as follow: W=10.4+0.05n (where range of “n”: 200-500) 4) The sporelings of the present laver somewhat resemble those of Bangia. However, they are distinctly different from each other in the relation between the number of cells and the length of filaments as well as in several other respects. For example, the sporelings of the laver are shorter than those of Bangia at the same stage of development. 5) Although the present laver are usually found growing densely, it hardly worth cultivating as it takes quite a long time to become large enough to be harvested and its thallus is too narrow even at maturity.
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