. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 261. Fig. 255. Acanthophora spicifera (Vahi) Børgs. Summit of a filament showing the axillary branches issuing from the basal cell of the trichoblasts. The tissue in the middle has been somewhat spoilt during the preparation. (About 270:1). further seen from the figure that the summit of the plant is protru- ding in the form of a py- ramid and not "bisweilen einer kleinen Scheitel- grube eingesenkt" as mentioned in Engler und Prantl, Natürl. Pflanzenfam., I Teil, Abt. 2, p. 435-6. Whe
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 261. Fig. 255. Acanthophora spicifera (Vahi) Børgs. Summit of a filament showing the axillary branches issuing from the basal cell of the trichoblasts. The tissue in the middle has been somewhat spoilt during the preparation. (About 270:1). further seen from the figure that the summit of the plant is protru- ding in the form of a py- ramid and not "bisweilen einer kleinen Scheitel- grube eingesenkt" as mentioned in Engler und Prantl, Natürl. Pflanzenfam., I Teil, Abt. 2, p. 435-6. When in full growth the sum- mit of the plant is quite enveloped and protected by trichoblasts. As the figure shows, the plant has a large apical cell, somewhat longer than broad, from the base of which flat segments are cut ofT. Each of these segments bears a trichoblast, the basal cells of which are developed before the segments are divided. A transverse section (Fig. 256) of the stem shows the central cell and the five pericentral ones surrounded by a thick paren- chymatic layer of cells, larger and with thin walls inside, small and thickwalled at the periphery. Plants have been found with tetraspores, antheridia and cy- stocarps. The tetraspores are developed in stichidial ramuli provided with spines (Figs. 254, 257 C), in contrast to the spineless, ovate roundish stichidia of Acanthophora Delilei Lamx., as mentioned and described by Falkenberg, 1. c, p. 229, tab. 22, fig. 3. But it is sel- dom that I have found stichidia in form like those of' Acanthophora Delilei, in which case there was only a single bare one in the upper end of the filament, the other stichidial branchlets all having spines (comp. flg. 257 C). The stichidial branchlets of the present species are very similar to those of Acanthophora orientalis J. Ag. as figured by Okamura in "Icones. Please note that these images are extracted from scanned page images that may have been digitally enhanced for read
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