Archive image from page 275 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 268 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. found. The tetrasporangia occur in the upper part of the fila- ments and are rather scattered, being either soUtary or a few together, with sterile segments between. The tetrasporangia are about lOfji broad. As I have previously pointed out), this species is found upon the roots of the mangroves in the lagoons; but it occurs also in the sea in deep water, about 8 fathoms or more. It has already been found at St. Croix by Ãrsted.
Archive image from page 275 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 268 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. found. The tetrasporangia occur in the upper part of the fila- ments and are rather scattered, being either soUtary or a few together, with sterile segments between. The tetrasporangia are about lOfji broad. As I have previously pointed out), this species is found upon the roots of the mangroves in the lagoons; but it occurs also in the sea in deep water, about 8 fathoms or more. It has already been found at St. Croix by Ãrsted. It seems to be not altogether common on the islands. St. Croix: Christiansted's Lagoon, Salt River. St. Tliomas: Bovini Lagoon. St. Jan: Off America Hill. Geogr. Distrib.: West Indies. Key West. 2. Polysiphonia spec. Some small tufts of a quite sterile Polysiphonia were found creeping upon old timber. It has four pericentral cells and its branches are developed at the base of the trichoblasts. The basal part (Fig. 262) of the tufts is formed by decum- bent, creeping füaments, composed of rather short cells, the seg- ments being nearly as long as broad, about 50/, Often rhizoids are developed, from every segment, forming in this way a long series (Fig. 262). The rhizoids have no cross walls and end in a small disc fixed to the substratum. From these basal filaments the erect ones arise. At their base these are of nearly the same size as the basal ones, towards the upper part they taper gradually to about one half of their diameter. The cells have nearly the same length, being about one to one and a half times the breadth of the filaments. In the upper part of the filaments each of the segments carries a trichoblast placed in T7- ono n 1 â 1. â a spiral line with a U rig. 262. Polysiphonia spec. 'â nnn Base of a filament. (About 80:1). divergency (Fig. 2Q6). 1) Børgesen, F. The algal vegetation of the lagoons in the Danish West Indies (Biologiske Arbejder tilegnede E
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