FIGURES 53–60. Odontidium hyemale, SEM. 53–55, 57–60. NMW.C.2015.001.Faroe.2014.5 in Reinvestigation of the type material for Odontidium hyemale (Roth) Kützing and related species, with description of four new species in the genus Odontidium (Fragilariaceae, Bacillariophyta)

FIGURES 53–60. Odontidium hyemale, SEM. 53–55, 57–60. NMW.C.2015.001.Faroe.2014.5. Eysturoy, Faroe Islands, stream. 56. NMW.C.2012.019.2012.Austria.13.sto.bryo.filalg. Area of Schwarzmoos lakes near Kühtai, Stubaier Alps, Austria, spring. 53. View of whole valve and girdle bands. 54, 56. View of whole valve. 55, 57. View of whole frustules in girdle view. 58. Internal view of whole valve. 59. Details of valve mantle and girdle band. 60. Internal view of apical pore field and rimoportula. Scale bars = 2 μm (Fig. 57), 1 μm (Figs 53–56, 58–60).