Figure 1: Differential interference contrast microscopy of colonies of six Glaucocystis species.

Shown at the same magnification. Scale bar, 20 μm. Note that each colony is enclosed by mother cell wall (arrows) tightly (c,f) or arranged in a less crowded way within an extended mother cell wall (arrowheads) (a,b,d,e). (a) G. geitleri E.G.Pringsh. ex Tos.Takah. & Nozaki sp. nov. strain SAG 229-1. (b) G. nostochinearum Itzigs. ex Rabenh. strain SAG 16.98. (c) G. incrassata (Lemmerm.) Tos.Takah. & Nozaki stat. nov. strain SAG 229-2. (d) G. oocystiformis Prescott strain 126. (e) G. miyajii Tos.Takah. & Nozaki sp. nov. strain Thu10. (f) G. bhattacharyae Tos.Takah. & Nozaki sp. nov. strain 118.