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Annals of Botany 15: 501-533, 1951
© 1951 Annals of Botany Company

RESEARCH-ARTICLE

The Structure and Development of Himanthalia lorea (L.) Lyngb1

MARGARET NAYLOR

Westfield College

The development of H. lorea has been followed in detail and comparisons made between comparable stages of development of plante from exposed and from sheltered habitats.

The origin and course of the longitudinal hyphae ie traced, and it is found that the distance behind the apex at which they arise varies at different stages of development.

The very pronounced surface growth leads to extreme elongation of the medullary cells which also develop characteristic dilations at the horizontal septa.

In the receptacles the production of the horizontally running hyphae appears to be connected with the formation of central air-spaces. In the older receptacles the cells of these hyphae become extremely swollen and form irregular blocks of pseudo-parenchymatous tissue.

The production of longitudinal hyphae is more marked in plants from more exposed habitats, and the inner cortex has thicker walled cells where the plants have to endure longer periods of intertidal exposure.


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