Polysiphonia lanosa | |
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Brown algae Ascophyllum_nodosum with hemi-parasitic red algae Vertebrata lanosa (Polysiphonia lanosa) | |
Scientific classification | |
(unranked): | Archaeplastida |
Division: | Rhodophyta |
Class: | Florideophyceae |
Order: | Ceramiales |
Family: | Rhodomelaceae |
Genus: | Polysiphonia |
Species: | P. lanosa |
Binomial name | |
Polysiphonia lanosa (L.) Tandy | |
Polysiphonia lanosa (Vertebrata lanosa; [1] Polysiphonia fastigiata) is a common species of the red algae (Rhodophyta) often to be found growing on Ascophyllum nodosum . [2]
The thalli of this species form dense tufts, [2] [3] each tuft up to 7.5 cm generally attached by rhizoids to the fronds of Ascophyllum . The erect cylindrical branches divide pseudodichotomously, that is forming two equal branches, one of the branches growing from a lateral branch. [2] A transverse section shows an axial cell surrounded by 12 to 24 peraxial cells. The axial cell is large and occupies about one third of the diameter of each branch, best seen in transverse section. It is deep brownish red in colour. [2]
Choreocolax polysiphoniae is a small parasitic alga which grows in a cushion-like manner to 1 mm in diameter on the branches of P. lanosa. [4]
Widespread growing epiphytically on Ascophyllum nodosum wherever it is found and occasionally on other species of Fucus . [2] [5]
The life history is a sequence of three phases: gametangial, carposporangial and tetrasporangial. Two of the phases are similar. [6] The plants are dioecious with spermatangial branches produced in tufts at the apices of the branches. [2] The cystocarps are borne, usually singly. [7] with a narrow ostiole from which carpospores are released. The tetraspores occur in spiral series [2] resulting from a simultaneous division into 4 equal spores. [8]
Common around the British Isles and on the shores of Europe from Iceland, Norway to Spain. Also Greenland and Newfoundland to New England. [2]
Palmaria palmata, also called dulse, dillisk or dilsk, red dulse, sea lettuce flakes, or creathnach, is a red alga (Rhodophyta) previously referred to as Rhodymenia palmata. It grows on the northern coasts of the Atlantic and Pacific Oceans. It is a well-known snack food. In Iceland, where it is known as söl, it has been an important source of dietary fiber throughout the centuries.
Ascophyllum nodosum is a large, common cold water seaweed or brown alga (Phaeophyceae) in the family Fucaceae, being the only species in the genus Ascophyllum. It is a seaweed that only grows in the northern Atlantic Ocean, also known in localities as feamainn bhuí, rockweed, Norwegian kelp, knotted kelp, knotted wrack or egg wrack. It is common on the north-western coast of Europe including east Greenland and the north-eastern coast of North America, its range further south of these latitudes being limited by warmer ocean waters.
Polysiphonia is a genus of filamentous red algae with about 19 species on the coasts of the British Isles and about 200 species worldwide, including Crete in Greece, Antarctica and Greenland. Its members are known by a number of common names. It is in the order Ceramiales and family Rhodomelaceae.
Dilsea carnosa, commonly known as the poor man's weather glass or the sea belt, is a species of red algae in the Dumontiaceae family of the order Gigartinales.
Dumontia contorta is a relatively small epiphytic algae of the sea-shore.
Polysiphonia atlantica is a small filamentous species of red marine algae Rhodophyta. The thalli form small tufts up to 3 cm long. The axes are ecorticate consisting of axial cells surrounded by four periaxial cells.
Polysiphonia brodiei (Dillwyn) Sprengel, now generally spelled "brodiaei", as it is named after James Brodie is a species of red algae in the Rhodophyta. It grows in tufts up to 36 cm long.
Polysiphonia ceramiaeformis, also called banded siphon weed, is a small red algae (Rhodophyta), in the genus Polysiphonia. Individuals are irregularly branched with the branches extending up to 5.5 centimetres (2.2 in) from a central node and ending in dense tufts of fibres.
Polysiphonia denudata is a small red alga, Rhodophyta, growing as tufts up to 20 cm long without a main branch axis.
Polysiphonia elongata is a small red marine algae in the Rhodophyta.
Polysiphonia fibrata is a species of Polysiphonia that grows as small dense tufted and finely branched marine alga in the Rhodophyta.
Polysiphonia furcellata (C.Agardh) Harvey is small marine red alga in the Division Rhodophyta.
Choreocolax polysiphoniae is a minute marine parasitic alga in the division Rhodophyta.
Polysiphonia nigra is a species of marine alga in the division Rhodophyta.
Polysiphonia opaca (C.Agardh) Moris et De Notaris is a small marine alga in the division Rhodophyta.
Polysiphonia stricta is a small red marine alga in the Division Rhodophyta.
Vertebrata subulifera is rather small marine alga in the division Rhodophyta.
Gymnogongrus griffithsiae is a small uncommon seaweed.
Gastroclonium reflexum is a small red marine seaweed.
Chylocladia verticillata is a medium-sized red marine alga.