| Polyides rotunda | |
|---|---|
 | |
Scientific classification  | |
| (unranked): | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Gigartinales |
| Family: | Polyidaceae |
| Genus: | Polyides |
| Species: | P. rotunda |
| Binomial name | |
| Polyides rotunda C. A. Agardh (1822) | |
Polyides rotunda is a species of small red marine alga in the family Polyidaceae.
Polyides rotunda grows to 20 cm (7.9 in) in length, its cartilaginous, terete and branches two or three times dichotomously. The branches are about 2 mm (0.079 in) in diameter reaching a uniform height. The holdfast is disc like. In colour it is purplish red. [1] [2]
Generally epilithic in rock pools in the littoral and upper sublittoral. [1] Sand tolerant. [3]
Generally distributed around Ireland, Great Britain, the Isle of Man and the Channel Islands. [4]
Polyides rotunda is dioecious. The spermatangial cells develop in swollen areas near the apices. Cystocarps develop near the apices. [1] The tetrasporangia are cruciate, that is cross-shaped. [5]
Furcellaria lumbricalis (Hudson) Lamouroux is very similar but can be distinguished by the holdfast which has claw-like branches while that of Polyides being disc-like. [6]
Fucus is a genus of brown algae found in the intertidal zones of rocky seashores almost throughout the world.
Pelvetia canaliculata, the channelled wrack, is a very common brown alga (Phaeophyceae) found on the rocks of the upper shores of Europe. It is the only species remaining in the monotypic genus Pelvetia. In 1999, the other members of this genus were reclassified as Silvetia due to differences of oogonium structure and of nucleic acid sequences of the rDNA.
Dumontia contorta is a relatively small epiphytic algae of the sea-shore.
Polysiphonia lanosa is a common species of the red algae (Rhodophyta) often to be found growing on Ascophyllum nodosum.
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 elongata is a small red marine algae in the Rhodophyta.
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 fibrillosa (Dillwyn) Sprengel is a species of marine red alga in the Rhodophyta.
Polysiphoides fucoides (Hudson) Greville is a common marine alga in the Division Rhodophyta.
Porphyra purpurea is a medium sized marine algae in the Division Rhodophyta.
Polysiphonia nigra is a species of marine alga in the division Rhodophyta.
Ceramium botryocarpum is a small red marine alga in the Division Rhodophyta.
Ceramium echionotum is a small marine alga in the division Rhodophyta.
Ceramium deslongchampsii is a small marine red alga in the Division Rhodophyta.
Ceramium secundatum is a small marine red alga.
Ceramium shuttleworthianum is a small marine red alga.
Membranoptera alata is a small red alga in the Rhodophyta.
Hypoglossum hypoglossoides, known as under tongue weed, is a small red marine alga in the family Delesseriaceae.
Phycodrys rubens is a red marine alga of up to 30 cm long.
Phyllophora pseudoceranoides, the stalked leaf bearer, is a small marine red alga.