Archive image from page 46 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Børgesen: Rhodophyceæ of the Danish W. Indies. 39 filaments from the lowermost part of the spore. These fila- ments consist of a few cells only and lie along the surface of the host in which they are not imbedded, or at the most only a little on their lower side. From the cells in these creeping filaments erect ones were found growing up in a few vigorous specimens (Fig. 36 b). The spore itself is quite globular, about 17// in diameter; it lies upon the surface of the
Archive image from page 46 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Børgesen: Rhodophyceæ of the Danish W. Indies. 39 filaments from the lowermost part of the spore. These fila- ments consist of a few cells only and lie along the surface of the host in which they are not imbedded, or at the most only a little on their lower side. From the cells in these creeping filaments erect ones were found growing up in a few vigorous specimens (Fig. 36 b). The spore itself is quite globular, about 17// in diameter; it lies upon the surface of the host plant. The plants are mostly fixed at the base of the pinnules of the host and many plants are often found surrounding each pinnule (Fig. 36 a). Most probably the ger- minating spore finds more shelter here. But plants occur also on other parts of the host and even upon the pinnules them- selves. From each spore a single (or in more vigorous plants two or more) erect filaments grow up. They consist of cylindric cells ;' in the basal part their diameter is about 8—9—11 yt, higher up the diameter increases and in vigorous plants it reaches a length of 13—14 [x. The length of the cells is often 80 fi and more. Towards the sum- mit the filaments again taper, their diameter reaching only 6—7/i, but the ends are not hairlike and the cells contain both chromatophore and pyre- noid (Fig. 35). The chromatophore (Fig. 37) is parietal, often with long prolongations along the wall of the cell and it contains a large lateral pyrenoid protruding markedly into the interior of the cell. The ramification begins from near the base but is further developed higher up. It is multilateral and the branches ramify copiously in the same manner. The sporangia (Fig. 35, 37) are oblong-oval or more elong- ated, subcylindric or subclavate. They are mostly sessile but Fig. 35. Acrochætium opeligenuin nov. spec. Small part of an erect ramified filament. (About 90 : 1).
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