Figure F19. Photomicrographs of filamentous fungal structures within CaCO3-filled vesicles in basalt at 51 mbsf in lithologic Unit L-2 (Schumann et al., 2004). Scale bars = (A) 1.5 mm, (B) 10 µm, (C, D) 20 µm. Hyphae divided by septa are shown by arrows in (C).