Tigrinifilum floridanum D.E. Berthold, Lefler & Laughinghouse sp. nov.

Figs 27–29, 31–33, 36–38

DESCRIPTION: Filaments solitary and free-floating, or attached to substrate. Filaments straight, wavy, to flexuous, (9–)10.2–19 µm wide with thick hyaline sheath. Trichomes cylindrical, (7–)8.0–19.2 µm wide. Cells slightly constricted between meristematic zones, highly constricted between dividing cells in older filaments. Cross-walls densely granulated and darkened. Cells discoid, wider than long, rarely isodiametric, 1.0–2.7 µm long. Cell content light to dark green, blue green, brown, and grey. Apical cell rounded, with occasional clear calyptra. Reproduction by fragmentation or hormogonia.

TYPE LOCALITY: USA. Florida: Elliot Key (Biscayne Bay) (25°23.810 ʹ N, 80°14.043 ʹ W).

HABITAT: Entangled within larger benthic cyanobacteria or dislodged floating mats.

ETYMOLOGY: Latin floridanum, in reference to the widespread occurrence of this cyanobacterium throughout the southern Florida coast.

HOLOTYPE: US 223427 (dried material in a metabolically inactive state of reference strain BLCC-M48), deposited in US National Herbarium, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA.

REFERENCE STRAIN: BLCC-M 48.

MATERIALS ANALYSED: BLCC-M 48, BLCC-M 50, BLCC-M 51, BLCC-M57, BLCC-M 66, BLCC-M 73, BLCC-M 77, BLCC-M 85, BLCC-M 87, BLCC-M 102, BLCC-M 107, BLCC-M 118, BLCC-M 119, BLCC-M 120.