. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Rhodophyceæ of the Danish W. Indies. 37 This species was found in a depth of about 10 meters i) growing upon Dictyota linearis. The largest specimen found had a length of up to 2 mm. The base of the plant consists of the original spore which during germination penetrates into the epidermal cells of the host forming a process (Figs. 32, 33) ; this is thinnest in its upper end where it passes through the wall of the host broad- ening more out downw^ards getting a somewhat obovate-clavate shape, by means of which the plant becomes mo
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Rhodophyceæ of the Danish W. Indies. 37 This species was found in a depth of about 10 meters i) growing upon Dictyota linearis. The largest specimen found had a length of up to 2 mm. The base of the plant consists of the original spore which during germination penetrates into the epidermal cells of the host forming a process (Figs. 32, 33) ; this is thinnest in its upper end where it passes through the wall of the host broad- ening more out downw^ards getting a somewhat obovate-clavate shape, by means of which the plant becomes more strongly fixed to the substratum. The process reaches in all a length of about 35// and reaches often the lower wall in the cell of the host plant. The spore itself lies freely above the wall of the host plant; it is nearly spherical with proportionally thick wall; its diameter reaches a length of about 20—22^. From this basal body a single erect fdament grows upwards; once only did I find two filaments arising from it (Fig. 33 b); but in this plant the primary filament had been destroyed and then another one was given off at the side of the first one. The erect filament is straight and at first not branched, higher up bran- ches are given off to all sides (Fig. 31); these are also very straight and issued from the principal filament in an acute angle and most often branched in a similar way. Against their summit all the filaments taper somewhat. The cells in the principal filament and the lowermost cells in the branches are cylindric, somewhat thick-walled, their dia- meter reaching a length of about 9—11// and their length up to 50//- In the summit on the other hand the cells are only about 5// thick while their length is about 50—60//. The cells contain a parietal chromatophore with a pyrenoid lying at the wall (Fig. 34). The monosporangia (Figs. 31 and 34) occur upon the inner 1) By a misprint is the depth in Part II (Dansk Bot. Arkiv, Bd. 2, Nr. 2, p. 54 [Reprint
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