. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish VV. Indies. 55 new endophytic filaments while upwards from their upper ends the assimilating and spore-bearing filaments arise. In this way the endophytic filaments form together proportionally dense clu- sters as most of the filaments run downwards nearly side by side; but now and then also endophytic filaments are found which bend outwards to the side, thus giving rise to new tufts in a similar way to that described by Rosenvinge for Acrochætiiim Nemalionis. But in Acrochætiiim phacelorhiziim it seems t
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish VV. Indies. 55 new endophytic filaments while upwards from their upper ends the assimilating and spore-bearing filaments arise. In this way the endophytic filaments form together proportionally dense clu- sters as most of the filaments run downwards nearly side by side; but now and then also endophytic filaments are found which bend outwards to the side, thus giving rise to new tufts in a similar way to that described by Rosenvinge for Acrochætiiim Nemalionis. But in Acrochætiiim phacelorhiziim it seems to be not so common. The endophytic filaments reach a thickness of up to 27 fji and the length of the cells is about 36/^. Most often they are thickest at the lowermost end tapering gradually up- wards. The wall of the filaments is often somewhat sinuous. From the upper end of this rhizome- like base the erect filaments arise as men- tioned above forming a more or less dense cluster; in a vigorous plant about 4—6 filaments are present; the remnants also of several broken off or dead filaments are often to be found. The erect filaments (Fig. 58) have spreading branches, in the upper part with some tendency to unilaterality. The filaments are thickest in the lowermost part, about 11—12 fx, tapering very grad- ually towards their summit, being here about 6/z thick; these thin ends of the filaments die gradually away. In spec- imens still in vigorous growth the fila- ments have blunt ends and do not taper so much. In the lowermost part the cells are about 40/x long, being mostly a little longer upwards, about biju. The cells are cylindrical and not constricted at the transverse walls. They contain a parietal chromatophore (Fig. 59) with a large pyrenoid protruding con- siderably into the interior of the cell. In the .specimens found the sporangia were not present in great number. They occur often a few together seriately near the base of the branches but, often also quite sc
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