. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 325 part of the branch is monosiphonous except the basal segment, the third one of the whole branch, which is polysiphonous; in vigorous plants the fourth and fifth segments, too, are polysiphonous. The plant is quite without cortex. Falkenberg has pointed out that in the Mediterranean Sea he has found two different forms namely a robust and very squarrose. Fig. 326. Heterosiphonia Wurdemanni (Bail.) Falkenb. var. ty pica. a, part of the thallus with rhizoids developed from the summit of the ra
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 325 part of the branch is monosiphonous except the basal segment, the third one of the whole branch, which is polysiphonous; in vigorous plants the fourth and fifth segments, too, are polysiphonous. The plant is quite without cortex. Falkenberg has pointed out that in the Mediterranean Sea he has found two different forms namely a robust and very squarrose. Fig. 326. Heterosiphonia Wurdemanni (Bail.) Falkenb. var. ty pica. a, part of the thallus with rhizoids developed from the summit of the ramuli. h, transverse section of the thallus. (a, about 180:1; b, about 300:1). form which is Hke the original specimens of Harvey from Key West, and a more slender and not so squarrose form. Both forms have been found in the West Indies (cp. Figs. 326 and 327). Fig. 326givesarepresentationof apartof the first-mentioned form. As seen in the figure the ramification is very squarrose. The branches are rigid, often curved with obtuse or acute angles and entangled between each other. They are composed of rather short cells, in the basal part about 60 \.i broad and about 70 \i long, tapering evenly upwards and running out into acute, mostly curved apices; towards the top the cells at the same time become shorter. In the main axis the segments have 5 pericentral cells in my plants (Fig. 3266); Falkenberg found 4—6 in his specimens. Of these cells the three are lying on the upper dorsal side, the two on the ventral side. The other form (cp. Fig. 327) is much more slender and of a. 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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