FIGURE 2. A–O in Roholtiella, gen. nov. (Nostocales, Cyanobacteria)-a tapering and branching cyanobacteria of the family Nostocaceae

FIGURE 2. A–O. Roholtiella bashkiriorum, sp. nov. A. Hormogonium. B–E. Young tapered, Calothrix-like filaments. F. Branching at the heterocyte. I, K. Isopolar filaments with intercalary heterocyte(s), arrow marks a point of subsequent breakage. G–H, J, M–N. Mature filaments becoming arthrospores and being released from the opened ends. L, O. Rows of arthrospores. P–X. Roholtiella fluviatilis, sp. nov. P, S. Young tapered filaments. Q–X. Mature filaments and formation of arthrospores. R. Double false branching. U. Row of arthrospores. X. Filaments with reddish colored sheath. Strains used in this figure: CCALA 1057 = B–C, F, I–J, L, O, CCALA 1059 = A, D–E, G–H, K, M–N. CCALA 1058 = P–X. Scale bar applies to all figures, in A, B, D–H, J–P, R, T–X = 20 μm, in C, I, Q, S = 50 μm.