FIGURE 3 in New and interesting aerial diatom assemblages from southwestern Iceland

FIGURE 3. SEM microscopy images of aerial diatom assemblages from southwestern Iceland. A–D. Orthoseira roeseana: A–B. external valve view with 3 and 4 carinoportulae in the center with a rim, and uniseriate striae, C. internal valve view shows the simple opening of the carinoportulae, D. external view of valve mantle and part of the girdle show the spatulate spines and irregular girdle bands. Scale bars as shown.