Capilliphycus flaviceps Lefler, D.E. Berthold & Laughinghouse, 2022

Berthold, David E., Lefler, Forrest W. & Laughinghouse, H. Dail, 2022, Recognizing novel cyanobacterial diversity in marine benthic mats, with the description of Sirenicapillariaceae fam. nov., two new genera, Sirenicapillaria gen. nov. and Tigrinifilum gen. nov., and seven new species, Phycologia 61 (2), pp. 146-165 : 149-150

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).

Figures

Figs 39–48. Microscope images of Capilliphycus. Scale bars = 50 µm. Fig. 39. Yellow apical region of C. flaviceps (reference strain BLCC-M137). Fig. 40. Extended sheath at the apices in C. flaviceps (reference strain BLCC-M137). Fig. 41. Diagonal fragmentation in C. flaviceps (reference strain BLCC-M137). Fig. 42. False branching in C. flaviceps (reference strain BLCC-M137). Fig. 43. Filaments growing past another in C. flaviceps (reference strain BLCC-M137). Fig. 44. Spiral morphology of some filaments of C. flaviceps (reference strain BLCC-M137). Fig. 45. Yellow apical cells of C. guerandensis (reference strain BLCC-M76). Fig. 46. Facultative sheath in C. guerandensis (reference strain BLCC-M76). Fig. 47. Diagonal fragmentation in C. guerandensis (reference strain BLCC-M76). Fig. 48. Tapering of apices in C. guerandensis (reference strain BLCC-M76).