Capilliphycus flaviceps Lefler, D.E. Berthold & Laughinghouse sp. nov.

Figs 39–44

DESCRIPTION: Thallus amorphous and entangled, mat-like. Filaments straight, 14–18.9 µm in diameter, rarely coiled. Sheath thick, facultative, hyaline, not lamellate. Cells slightly constricted. Cross walls densely granulated. Cells discoid, wider than long, 10.7–14 µm wide, 1.4– 2.4 µm long. Cell content green, green-yellow, and yellow at apices. Apices conical to rounded, without calyptra. Hormogonia formed by straight fragmentation, with or without necridic cells. Diagonal fragmentation occurs with or without necridic cells.

TYPE LOCALITY: USA. Florida: Key Biscayne (25°43.588 ʹ N, 80°09.513 ʹ W).

HABITAT: Found within floating marine mats of larger filamentous cyanobacteria.

ETYMOLOGY: Latin adjective flavus, -a, -um, yellow, and Latin ending - ceps (caput), head, in reference to the tendency for yellowing of the apices of the trichome.

HOLOTYPE: US 227779 (dried material in a metabolically inactive state of reference strain BLCC-M137), deposited in US National Herbarium, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA .

REFERENCE STRAIN: BLCC-M 137.

MATERIALS ANALYSED: BLCC-M 137, BLCC-M 53 (US 227634).