Fig. 4

L. undulata n. sp., valve (a–k). a, b Live cell in valve view. b Detail of live cell showing pyrenoids. c Entire holotype valve; details in series of views (d–f) showing elongated areola pattern along sternum, waves, and an inflated footpole with rimoportula. g Entire internal view of valve in SEM. h Internal view of the apex of a different specimen with elongated areolae along sternum and an apically oriented rimoportula. i Detail of wave character in same valve as (g). j Internal view of basal pole with multiscissura and a rimoportula to the left of the midrib. k External view of basal pole with multiscissura. Scale bars: b, d–f, h–i, 10 μm, a, c, g, 20 μm, j–k, 5 μm