Archive image from page 376 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Borgesen: Rhodophyceæ of the Danish W. Indies. . 369 formed everywhere from the surface of the thallus. By means of such discs the filaments of the plant, too, fix themselves mutu- ally together to each other. The connection is so intimate that mostly it is impossible to decide from which of the two connected filaments the hapteron is given off. If we examine the apex of the filaments (Fig. 361 c) it ap- pears that the thallus increases by means of several filaments
Archive image from page 376 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Borgesen: Rhodophyceæ of the Danish W. Indies. . 369 formed everywhere from the surface of the thallus. By means of such discs the filaments of the plant, too, fix themselves mutu- ally together to each other. The connection is so intimate that mostly it is impossible to decide from which of the two connected filaments the hapteron is given off. If we examine the apex of the filaments (Fig. 361 c) it ap- pears that the thallus increases by means of several filaments placed Fig. 361. Wurdemannia selacea Harv. a, transverse section of the thallus. h, longitudinal section of the thallus. c, apex of a filament, (a, about 240:1; b, about 130:1; c, about 80:1). close together and from which the different cell-tissues are formed. Upon a transverse section of the thallus (Fig. 361 a) three diffe- rent layers are visible. In the middle a medullary tissue is present composed jof smaller thick-walled, roundish polygonal cells; from a longitudinal section (Fig. 361 h) it appears that these cells are rather long, cyhndrical, but of variable length about 250 ja long at their greatest; the transverse walls are often somewhat obhque. Then follows a parenchymatic tissue, whose innermost cells are larger gradually diminishing outwards. A transverse section shows these cells to be nearly circular in outline, while a longitudinal section shows them to be actually oblong about 60 long. Finally, the epidermal tissue consists of a single layer of cells only; the cells are nearly as long as broad; when seen from above roundish polygonal; their diameter is about 12 \x. Dansk Botanisk Arkiv, Bd. 3. Nr. 1 (192). 24
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