Observations on Furcellaria fastigiata (L.) Lam. forma aegagropila Reinke in Danish waters together with a note on other unattached algal forms

Biology of Furcellaria lumbricalis (Hudson) Lamouroux (Rhodophyta: Gigartinales), a commercial carrageenophyte

“…On these grounds, some early authors (e.g. Oder, 1768, in Austin, 1960a) regarded this form as a separate species. Forma aegagropila also differs from the typical form in its sterility.…”

“…Like other seaweeds of ecologically diverse situations, F. lumbricalis is subject to phenotypic variation, and several morphological ecotypes consequently have been reported (Austin, 1960a). Minor variations occur in stature and frond diameter, according to position on the shore and degree of exposure, while more extreme deviations like dwarfism are characteristic of thalli in the rigorous conditions of the Arctic and inner Baltic Sea.…”

“…Freely rolling thalli are apt to become spherical, with progressive shading and deterioration of their proximal axes. Stationary large thalli undergo similar degeneration of lower axes after prolonged shading and contact with soft sediments (Austin, 1960a).…”

“…Growth is apical and progressive, with no seasonal erosion of fronds except for shedding of spent reproductive termini. Regeneration occurs from the surface of the resulting truncations or from other wounds, to form 'axial regenerated branches' (Austin, 1960a) that are an integral part of the thallus construction. The regularly dichotomous branching, however, may be disrupted by regeneration of three to ten shoots from a single wound (Austin, 1960a;Blinova, 1977).…”

Plant size and reproductive phenology of six species of rhodophyta in subtidal isle of man

“…Males, females and tetrasporophytes have been noted in ascending order of size in Furcellaria lumbricalis (Austin, 1960), Ceramium tenuicorne (Kfitz.) Waern (Waern, 1952), and C. rubrum (Garbary, Grund & McLachlan, 1978).…”