. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the W. Indies. 127. Fig. 135. Grateloupia cuneifolia J. Ag. Transverse section of the thallus with tetrasporangia. (About 550 :1). ramified filaments running between each other in all directions in the mucilage found here. In a longitudinal section it is seen that the medullary cells are very irregularly branched often more or less starlike (Fig. 136); the breadth of the cells is also very vari- able and this is also the case regarding the length of the cells. The develop- ment of these starlike cells is jus
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the W. Indies. 127. Fig. 135. Grateloupia cuneifolia J. Ag. Transverse section of the thallus with tetrasporangia. (About 550 :1). ramified filaments running between each other in all directions in the mucilage found here. In a longitudinal section it is seen that the medullary cells are very irregularly branched often more or less starlike (Fig. 136); the breadth of the cells is also very vari- able and this is also the case regarding the length of the cells. The develop- ment of these starlike cells is just the same as is de- scribed by Berthold (1. c, p. 2) for Halymenia. The filaments having got some length swell at the end and from this thickened part filaments grow out in all directions; the ends of some of these filaments meet other similar ones and fuse together with them or their ends swell and give rise to new star-like cells. The cortical layer is composed of short dichoto- mously ramified filament;?. The innermost cells in these are the largest and more irregularly shaped, the outermost small oval to subcylindrical 8—9 /i long and about 3 // broad and rather closely packed together. The tetrasporangia (Fig. 135) are formed in the cortical layer and occur scattered over the whole surface of the thallus. They are cruciately divided about 30;/ long and 19 fi broad. Among the dried specimens a single cystocarpic one was found. While the tetrasporic specimens have quite a smooth sur-. 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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