usually strictly simple, occasionally one-stage-branched with 1 divergent, branch-like metula developing low on the stipe or with 2 apical metulae, rarely ramigenous with 2(-3) divergent branch-like metulae arising singly at different levels from the stipe[2]
(with 2 close equatorial ridges, 0.2-0.5 µm wide, and with smooth to roughened valves) with 2 close equatorial ridges, 0.2-0.5 µm wide, and with smooth to roughened valves[2]
(cylindrical base and a short, slightly narrowed neck, occasionally longer, up to 16 µm) cylindrical base and a short, slightly narrowed neck, occasionally longer, up to 16 µm[2]
Notice: The data in the table above is semi-automatically extracted from the description. Please be sure to check the original documents for accurate information.