. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 51 The germinating spore grows downwards through the thick peripheral wall of the host plant until it arrives at the more compact innerwall of the cells. Here it ramifies sending out some few short horizontal branches (Fig. 50). These consist of thick-walled cells nearly as long as broad or a little longer and much swollen in their middle part, the endophytic filaments thus assuming a moniliform appearance (Fig. 51 c). The length of the cells is about 12—14 fj. and the breadth about 11 fjt. Fro
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 51 The germinating spore grows downwards through the thick peripheral wall of the host plant until it arrives at the more compact innerwall of the cells. Here it ramifies sending out some few short horizontal branches (Fig. 50). These consist of thick-walled cells nearly as long as broad or a little longer and much swollen in their middle part, the endophytic filaments thus assuming a moniliform appearance (Fig. 51 c). The length of the cells is about 12—14 fj. and the breadth about 11 fjt. From this endophytic basal part the erect free filaments arise (Figs. 50, 51 a, c). These are more or less ramified through their whole length, in the lowermost part on all sides, but higher up often uniserially; they taper only slightly towards their summits. The filaments consist of cylindrical cells chætium hor- which at the basal part are about 9—11 ^ broad morhi^mnoY. and about 30—50 fx long, in the upper end 8—9 ^ flianient with broad and about 60 fx long. The branches ramify sporangia. repeatedly. All the branches are mostly rather straight. The cells contain a plate-shaped chromatophore (Fig. 52) with a well developed pyrenoid protruding somewhat into the interior of the cell. The sporangia (Figs, blh, 52) are mostly sessile but some are pedicellate. They occur as a rule upon the lowermost cells of the fila- ments seriate upon their upper side, but now and then also more scattered. The sporangia are ob- long-elliptic of shape, about 20—22 fx long and 10—11 fx broad. Found once only in a sheltered locality. St. Croix: Christiansteds Fig. 53. Acrochsetium H]jpneæ Børgs. Base of a plant. (About 300: 1). 18. Acrochætium Hypneæ Børgs. Chantransia Hypneæ Børgs., Some new or httle known West Indian Florideæ, I (Bot. Tidsskr., 30. Bd., København 1909). 4*. Please note that these images are extracted from scanned page images that may have been digit
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