. Dansk botanisk arkiv. Plants; Plants -- Denmark. Fig. 112. Galaxaura fragilis Lamk Part of the thallus. (About li/^: 1) spherical and have rather well developed chromatophores. Finally we arrive at the epidermal cells, the real assimilating ones. These are short, 10—12/^ long and 20—24/^ broad, in transverse sec- tion often triangular, when seen from above 5—7-gonal and closely united (comp, those found in G. squalida, Fig. 106). They contain a well developed cam- panulate chromatophore with long branched prolongations running down along the walls of the cells (Fig. 110); in the middle of th
. Dansk botanisk arkiv. Plants; Plants -- Denmark. Fig. 112. Galaxaura fragilis Lamk Part of the thallus. (About li/^: 1) spherical and have rather well developed chromatophores. Finally we arrive at the epidermal cells, the real assimilating ones. These are short, 10—12/^ long and 20—24/^ broad, in transverse sec- tion often triangular, when seen from above 5—7-gonal and closely united (comp, those found in G. squalida, Fig. 106). They contain a well developed cam- panulate chromatophore with long branched prolongations running down along the walls of the cells (Fig. 110); in the middle of the chromatophore a pyrenoid is present. But be- sides this, the real assimilating tissue, the plant possesses the above mentioned assimilating fdaments (Fig. 109); these are composed of a row of cells which are abuot 2—3 times as long as broad (lat. about 15—18 fj) and have thick walls, 4 ^ thick. They contain a much ramified chro- matophore. The chalk incrustation is richly developed and found through- out the whole tissue. A specimen from the harbour of Christianssted had ap- parently ripe cystocarps. These are nearly spherical with an opening above. The carpospores are large, oval, about 50 fi long and 30 ^ broad. My specimens seem to agree very well with the description of Kjellman and with the original specimens from St. Croix. As pointed out above with regard to G. rugosa, this species is nearly related to the present one; for the differences between them I refer to the comparative remarks given above. Galaxaura squalida has been ga- thered both in shallow water in more sheltered places and in deeper water at a depth of about 30 meters and in more open sea. It was found in the following localities: St. Croix: Christianssteds Harbour, off Frederikssted. At the shores of this island it was also col-. Fig. 113. Galaxaura fragilis Lamk. a, epidermal cells seen from above, b, fila- ments from the dia- phragms. (About 250:1).. Please note that these images are extracte
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Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
