By Robert B. McLaughlin
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Additional info for An Introduction to the Microscopical Study of Diatoms
The raphe slit in that case is usually seen in the terminal or polar nodules and extends for a variable but short distance into the valve mantle. The ends of the raphe which might be regarded as primitive terminal fissures, branch into the protoplasm at angles. No true central nodule is present in the genus Eunotia.
It will be noted that the intercalary band cell into here is continuous, but the septum extends only about compartments. halfway the length of the frustule. In Tetracyclus (Figure 11E) the septa developed is more at the ends than at the sides, but the structure is opened at one end. Other forms of septa are illustrated in Figure 11. In Figure 11A the Grammatophora type of septa is illustrated in an apical (or sagittal) section. Note here that the valve mantle itself has produced slightly into the interior of the frustule a pseudo-septum at each end.
If a raphe is a vertical or sloped fissure it generally appears as in Figures 24A and 24B and is considered simple and so designated in diatom descriptions. The vertical fissure appearing as a single line is sometimes termed filiform, distinguishing it from the sloping fissure which is assigned the term ligamentous. If the raphe Page 42 An Introduction to the Microscopical Study of Diatoms consists of a combination of a horizontal ―V‖ and vertical and/or sloping fissures in one view, it is termed complex (Figure 24C).