Archive image from page 362 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Borgesen: Rhodophyceæ of the Danish W. Indies. 355 struction of the stem, but as this is rather brief. I shall give a fur- ther description together with some figures. lpon a transverse section of the main stem in the neighbourhood of the place where the pair of branches issue we find an arrangement like that shown in Fig. 350 6. The central cell is here very large, its diameter reaching a length of about 180 \x. It is surrounded by a cir- cular open space filled wi
Archive image from page 362 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Borgesen: Rhodophyceæ of the Danish W. Indies. 355 struction of the stem, but as this is rather brief. I shall give a fur- ther description together with some figures. lpon a transverse section of the main stem in the neighbourhood of the place where the pair of branches issue we find an arrangement like that shown in Fig. 350 6. The central cell is here very large, its diameter reaching a length of about 180 \x. It is surrounded by a cir- cular open space filled with sap, round which again follows the rather thick, parenchymatous, peripheral tissue. On both sides of the central cell, but not exactly op- posite, two filaments issue. One of these fila- ments is thicker and more vigorous than the other and both extend themselves in the bran- ches given off here the more vigorous in the thickest, the other in the thinnest of the two bran- ches. From the first cell of these ramifications, the one nearest to the central cell, thin hyphæ- like filaments issue in all directions, the cells in this way becoming stellately ramified. These thin filaments run up and down in the space within the interior wall of the peripheral tissue; they are rather irregularly, often sub- dichotomically, ramified. The peripheral tissue itself consists of 5—6 layers of cells of roundish shape, largest in the interior, de- creasing gradually towards the periphery. A longitudinal section (Fig. 350 a) shows that the central axis consists of very long cells about 1500 \x long, being in the upper part cylindrical (about 45 n thick) and in their lowest part much swollen, nearly globular. It is from this globular part that the branches issue. Of this plant only female ones were gathered. The procarps oc- curred at the tip of short clavate branchlets (Fig. 351) growing 23
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