. Dansk botanisk arkiv. Plants; Plants -- Denmark. 326 Dansk Botanisk Arkiv. Bd. 3. Xr. 1. softer consistence. The ramification of the branches is scarcer, the branches are slender with thinner and longer cells; the unbranched summit of the first branch in the branch-system is especially much elongated. In the basal part of the monosiphonous ends of these branches the cells are about 40 n thick and their length about 70 |li. Towards the top the cells become somewhat longer (about 120 ^), tapering at the same time evenly to the summit where the breadth is about 25 |lI. The uppermost end of the
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 326 Dansk Botanisk Arkiv. Bd. 3. Xr. 1. softer consistence. The ramification of the branches is scarcer, the branches are slender with thinner and longer cells; the unbranched summit of the first branch in the branch-system is especially much elongated. In the basal part of the monosiphonous ends of these branches the cells are about 40 n thick and their length about 70 |li. Towards the top the cells become somewhat longer (about 120 ^), tapering at the same time evenly to the summit where the breadth is about 25 |lI. The uppermost end of the filaments is often a little swol- len or it becomes rhizoid-hke (Fig. 328 b). In this form the polysiphonous axis has always 4 peri- central cells and ne- ver more (Fig. 328 c). While all the gather- ings of the squarrose form were sterile, this one had stichi- dia with ripe tetra- spores (Fig. 327). The stichidia (Fig. 328 a) are placed at the ends of one of the ramifications of the second branch. They are acute, subcylindrical of shape with broadly rounded base. In the cylindrical part they are about 110 jii thick. They have a longer or shorter, monosiphonous stalk composed of a variable num- ber of cells up to ten. My description above proves that the two forms are very different, and Falkenberg, too, points out that perhaps we have to do with two different species. As they agree in so many respects I prefer to consider them only as varieties of the same plant. The first one, the squarrose form, according to Falkenberg being like the. Fig'. 327. HeterosiphoniaWurdenianni (Bail.) Faikb. var. laxa n. var. Upper part of tlie thallus witli young stichidia. '(About 35:1).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dansk botanisk forening. Kbenhavn : Dansk botanisk forening
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