Phormidium ambiguum Gomont, 1892

Gupta, Pratibha, 2021, First report of diversity of Cyanobacteria of Broknes Peninsula of Larsemann Hills, East Antarctica, Cryptogamie, Algologie 20 (15), pp. 241-251 : 247

Phormidium ambiguum Gomont

Annales des Sciences Naturelles, Botanique, Série 7 (16): 178 ( Gomont 1892). Desikachary, Cyanophyta 266, t. 44, f. 16 ( Desikachary 1959). Komárek & Anagn., Cyanoprokaryota Part 2: Oscillatoriales 19 (2): 479 ( Komárek & Anagnostidis 2005).

DESCRIPTION. — Filament elongate; sheath thin, firm, mucilaginous, colourless, sometime thicker diffluent, sometimes more or less lamellated; trichome slightly constricted or sometimes not constricted at the cross-walls; end not attenuated, not capitate, blue-green; cells not granulated at the cross-walls or sometimes granulated; end cell rounded, calyptra absent ( Fig. 8I ).

DIMENSION. — Trichome 3.5-7. 8 µm broad and cells 1.2-3.4 µm long.

ENVIRONMENT & HABITAT. — Freshwater and marine species; wet rocks, free-floating & benthic in stagnant water; temperature 3.5°C.

Figures

FIG. 8. — Cyanoprokaryotes of Broknes Peninsula. A, Chroococcus minutus (Kütz.) Nägeli; B, Gloeocapsa biformis Ercegovic; C, Cyanosarcina burmensis Skuja, D, Oscillatoria anguina (Bory) Gomont; E, Oscillatoria curviceps C.Agardh ex Gomont; F, Oscillatoria limosa C.Agardh ex Gomont; G, Planktothrix rubescens (DC. ex Gomont) Anagn. & Komárek; H, Lyngbya confervoides C.Agardh ex Gomont; I, Phormidium ambiguum Gomont; J, Phormidium bekesiense (I.Kiss) K.Kiss,; K, Oscillatoria jenensis G.Schmid; L, Phormidium subfuscum Kütz. ex Gomont; M, Oscillatoria tenuis C.Agardh ex Gomont; N, Aulosira fritschii Bharadwaja; O, Coleospermum goeppertianum (goppertianum) Kirch. ex Frank; P, Stigonema mesentericum Geitler. Scale bars: A, N, O, 30 µm; B, C, F, I, L, 10 µm; D, E, G, H, J, K, M, P, 20 µm.