. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rbodophyceæ of the Danish W. Indies. 35 Fig. 29 b shows a supposed yoimg plant. The germinating spore has given off a single cell, the earliest beginning of the creeping basal filaments, and from this cell an erect filament arises. In the full grown plant a great number of erect filaments grow up from the inner part of the basal part; those in the middle are straight, those in the periphery are bent outwards. In the lower part the filaments are about 9—10/^ broad tapering somewhat towards the summit where the diameter of the cells
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rbodophyceæ of the Danish W. Indies. 35 Fig. 29 b shows a supposed yoimg plant. The germinating spore has given off a single cell, the earliest beginning of the creeping basal filaments, and from this cell an erect filament arises. In the full grown plant a great number of erect filaments grow up from the inner part of the basal part; those in the middle are straight, those in the periphery are bent outwards. In the lower part the filaments are about 9—10/^ broad tapering somewhat towards the summit where the diameter of the cells is only about 6—7 fi. The cells are about 2—3 times as long as broad in the basal part, reaching a length of about 18—35//; in the upper part the length is about 30—?>b ft. The cells contain a parietal chromatophore (Fig. 30) with longer or shorter prolongations along the wall of the cell and a large lateral pyrenoid protruding greatly into the interior of the cell. The sporangia are situated upon small secund mostly two-celled branchlets (Fig. 29 a) ; they are placed on the upper, inner side of the branches upwards from the axils. They are ovate-oblong (Fig. 30); 14— 16// long and 9—10/< broad. This species is evidently nearly related to Acrochætiiim Sagræaniim Borneti). I have compared my specimens with the large plant distributed in Phycotheca Nr. 39 under the name of Chantransia. Fig. 30. Acrochætium flexuosum Vickers, a, part of a filament with sporangia - bearing virgatula and upon which Bornet has partly branchlet. b, a spor- based his description of this species. But ^"^'"JioTt'TOrir""^" the present species is \ much smaller and differs among other things by having proportionally shorter cells. This species seems to be common upon Chætomorpha antennina of which the ends of the filaments often are red coloured by the epiphyte. St. Croix: Northside. Geogr. Distrib.: Barbados. 10. Acrochætium unipes nov. spec. T
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