FIGURE 4 in New and interesting aerial diatom assemblages from southwestern Iceland

FIGURE 4. Light (A–I, N–c) and SEM (J–M) images of aerial diatom assemblages from southwestern Iceland, Eunotia species. A–F, J–L. Eunotia palatina: A–F. size diminution series, the striae end short on the valve face to create the appearance of a hyaline strip (i), J. internal views of a valve apex showing the location of the helictoglossa, a hyaline area (i) and swelling where the proximal raphe ends (ii), K. a whole valve, internal view (scale bar as in L), and L. a frustule with both valve and girdle views visible; G–I, M. Eunotia arctica: G–I. valve views, M. external view shows striae and hyaline band along the ventral edge; N. Eunotia cf. valida: valve view; O–P. Eunotia cf. fallax: valve view; Q–W. Eunotia neofallax: valve view, V. half valve / half girdle view, and W. girdle view; X–c. Eunotia nymanniana: valve view. LM scale bar = 10 μm, SEM scale bars as shown.