FIGURE 2. Morphology of Nisada stipitata. A. Macroscopic view of partially covered rock (black portion). B. Macroscopic view of strip of biofilm on rock. C. (tv) Pseudofilament apices in fluorescent microscopy. D. (tv) Edge of biofilm with pseudofilaments in a row. E. (tv) Apices of morph 2 before cell division (single arrow) and after division but before separation (double arrow). F. With dying filaments of Kyrthuthrix cf. maculans. G. (tv) Colonial mucilage (single arrow); apices of morphs 1 and 2 and (lv) two morphs 2 (double arrows). H. (tv) Apices of morph 1 with a few pseudofilaments in lv (arrow heads); pad of a complete pseudofilament (white arrow) and colonial mucilage (black arrow). I. (lv) Pseudofilament of morph1 with developed stipe and cups; "horns" (sheath) with synchronous growth (arrows). Daughter much larger than mother cell.J. (lv) Pseudofilament of morph 1 without pad (base of stipe, arrow). K. (lv) Pseudofilament of morph 1 showing "horns" (sheath) with asynchronous growth (arrows). L, M. Diversity of morphology of morph 1. Micrographs D–M with light microscopy. tv = top view, lv = lateral view. Scale bars: A = 1 mm, B = 200 μm, C = 25 μm, D–H, J, L = 6 μm I, K, M = 3 μm.