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| Polysiphonia elongata | |
|---|---|
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| herbarium specimen of Polysiphonia elongata | |
Scientific classification  | |
| (unranked): | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Ceramiales |
| Family: | Rhodomelaceae |
| Genus: | Polysiphonia |
| Species: | P. elongata |
| Binomial name | |
| Polysiphonia elongata (Hudson) Sprengel | |
Polysiphonia elongata is a small red marine algae in the Rhodophyta.
Polysiphonia elongata is a small red alga which, unlike some other species of Polysiphonia , does not grow as tufts. It has erect cylindrical main branches and is densely branched growing to a height of 30 cm. The main branches bear lateral branches, each branch consists of a central axes of cells with four periaxial cells. These periaxial cells are arranged in an elongated manner all of the same length around the central axial cells. Cortical branches develop growing downwards in the grooves between the periaxial cells and increasing the thickness of the major branch. The final branches are pointed at the apex and attenuate at their base. [1] Trichoblasts are few. It grows attached by a disk-like holdfast. [2]
P. elongata grows intertidally and sublittorally on rock, [3] stones and artificial material also on other algae. [2]
The plants are dioecious. Spermatangial branchlets are borne near the apices of young branches. Cystocarps are ovoid and slightly stalked. Tetraspores occur in spiral series in the upper branches. [2]
P. elongata is common around Ireland, [4] Great Britain including the Channel Islands, the Isle of Man and the Shetland Islands. [3] In the Atlantic from Norway to the Mediterranean and in New England. [2]
Ceramium is a genus of Ceramium algae. It is a large genus with at least 15 species in the British Isles.
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.
Polysiphonia lanosa is a common species of the red algae (Rhodophyta) often to be found growing on Ascophyllum nodosum.
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 devoniensis is a species of marine algae. It is a small red alga in the Division Rhodophyta. It is a species new to science only described recently and first published in 1993.
Polysiphonia elongella Harvey in W.J. Hooker is a branched species of marine red algae in the genus in the Polysiphonia in the Rhodophyta.
Polysiphonia fibrata is a species of Polysiphonia that grows as small dense tufted and finely branched marine alga in the Rhodophyta.
Polysiphoides fucoides (Hudson) Greville is a common marine alga in the Division Rhodophyta.
Polysiphonia furcellata (C.Agardh) Harvey is small marine red alga in the Division Rhodophyta.
Melanothamnus harveyi, Harvey's siphon weed, is a small marine red alga in the division of Rhodophyta.
Polysiphonia nigra is a species of marine alga in the division Rhodophyta.
Polysiphonia simulans 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.
Vertebrata fruticulosa(Boergeseniella fruticulosa Kylin) is a small marine alga in the Division Rhodophyta.
Vertebrata thuyoides is a small marine algae in the Division Rhodophyta.
Ceramium shuttleworthianum is a small marine red alga.