. Botany of the Faeröes, based upon Danish investigations. Botany -- Faroe islands. Fig. 119. Thalassiosira subtilis (Ostf.) Gran. An aggregation of cells em- bedded in the mucilage i15"/V. and a valve of a cell showing the »pseu- do-nodule« («o/t). each valve are distinguishable. ferent cells afler their position in the mucilage; that is at least the case judging Ironi preserved material. In some of the cells two daughter- cells are formed; they are somewhat separated from each other and yet kept together by the connecting zone. After ignification and embedding in styrax the structur
. Botany of the Faeröes, based upon Danish investigations. Botany -- Faroe islands. Fig. 119. Thalassiosira subtilis (Ostf.) Gran. An aggregation of cells em- bedded in the mucilage i15"/V. and a valve of a cell showing the »pseu- do-nodule« («o/t). each valve are distinguishable. ferent cells afler their position in the mucilage; that is at least the case judging Ironi preserved material. In some of the cells two daughter- cells are formed; they are somewhat separated from each other and yet kept together by the connecting zone. After ignification and embedding in styrax the structure of the cell is seen with diffi- culty; the valve (16â32 \i in diameter) is arched and without any visible structure; seen from the front, a small, but distincl »pseudo-nodule« is to be observed at some distance from the margin, which appears to be very faintly and closely spiniferous, but the last observation may be wrong. In girdle-view a connecting band and two narrow connecting rings, one belonging to The cells are thus formed much in the same way as in the Thalassiosirae of the section Pseudolauderia, and by the absence of the mucilaginous thread and the existence of the amorphous mucilage this species seems to form a connecting link between this section of the Thalassiosira and the Landeria, especially L. glacialis (Grim.) Gran. It has been found once (March 1900) around the Færoes. 6. T. bioculata (Grun.) Ostf. n. nora.; Coscinodiscus bioculatus Gru- now, Diat. Franz Josefs Land, Denkschr. d. K. Akad. d. Wissensch., Bd. 48. Wien 1884, p. 107, PI. C, fig. 30, & D, figs. 1-2; Gleve, Baff. Bay. 1896, p. 10, PI. II, fig. 13; Coscinodiscus sp. Ostenfeld, Iagttagelser, 1900, p. 52. A chain-diatom predominates in the samples of AugustâSeptember of 1902; the same species occurs also in AprilâMay, but rarely. The cells are cylindrical, often higher than they are broad (diameter 30â60 /«, height 40â60 ,»). Besides the connecting band a great number
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903
