Algae (seaweed)
Seaweed is a loose colloquial term encompassing macroscopic, multicellular, benthic marine algae. The term includes some members of the red, brown and green algae. Seaweeds can also be classified by use (as food, medicine, fertilizer, industrial, etc.). Like all algae, seaweeds are not plants. A seaweed may belong to one of several groups of multicellular algae: the red algae, green algae, and brown algae. As these three groups are not thought to have a common multicellular ancestor, the seaweeds are a polyphyletic group. In addition, some tuft-forming bluegreen algae (Cyanobacteria) are sometimes considered to be seaweeds — "seaweed" is a colloquial term and lacks a formal definition. Two specific environmental requirements dominate seaweed ecology. These are the presence of seawater (or at least brackish water) and the presence of light sufficient to drive photosynthesis. Another common requirement is a firm attachment point. As a result, seaweeds most commonly inhabit the littoral zone and within that zone more frequently on rocky shores than on sand or shingle. Seaweeds occupy a wide range of ecological niches. The highest elevation is only wetted by the tops of sea spray, the lowest is several meters deep. In some areas, littoral seaweeds can extend several miles out to sea. The limiting factor in such cases is sunlight availability. The deepest living seaweeds are some species of red algae. A number of species such as Sargassum have adapted to a fully planktonic niche and are free-floating, depending on gas-filled sacs to maintain an acceptable depth. Others have adapted to live in tidal rock pools. In this habitat seaweeds must withstand rapidly changing temperature and salinity and even occasional drying.
Valonia ventricosa - Valoniaceae

Valonia ventricosa - Valoniaceae

Tydemania expeditiones - Udoteaceae

Tydemania expeditiones - Udoteaceae

Halimeda copiosa - Halimedaceae

Halimeda copiosa - Halimedaceae

Halimeda macroloba - Halimedaceae

Halimeda macroloba - Halimedaceae

Halimeda opuntia - Halimedaceae

Halimeda opuntia - Halimedaceae

Avrainvillea obscura - Dichotomosiphonaceae

Avrainvillea obscura - Dichotomosiphonaceae

Avrainvillea lacerata - Dichotomosiphonaceae

Avrainvillea lacerata - Dichotomosiphonaceae

Caulerpa racemosa - Caulerpaceae

Caulerpa racemosa - Caulerpaceae

Caulerpa serrulata - Caulerpaceae

Caulerpa serrulata - Caulerpaceae

Dictyosphaeria versluysii - Pithophoraceae

Dictyosphaeria versluysii - Pithophoraceae

Neomeris annulata - Dasycladaceae

Neomeris annulata - Dasycladaceae

Codium spongiosum - Codiaceae

Codium spongiosum - Codiaceae

Ulva intestinalis- Ulvaceae

Ulva intestinalis- Ulvaceae

Sargassum fluitans - Sargassaceae

Sargassum fluitans - Sargassaceae

Hydroclathrus clathratus- Scytosiphonaceae

Hydroclathrus clathratus- Scytosiphonaceae

Padina australis - Dictyotaceae

Padina australis - Dictyotaceae

Zellera tawallina - Delesseseriaceae

Zellera tawallina - Delesseseriaceae

Halymenia durvillei - Halymeniaceae

Halymenia durvillei - Halymeniaceae

Gibsmithia hawaiiensis - Dumonthiaceae

Gibsmithia hawaiiensis - Dumonthiaceae

Tricleocarpa fragilis - Galaxauraceae

Tricleocarpa fragilis - Galaxauraceae

Peyssonnelia sp. - Peyssonneliaceae

Peyssonnelia sp. - Peyssonneliaceae

Peyssonnelia sp.1 - Peyssonneliaceae

Peyssonnelia sp.1 - Peyssonneliaceae

Lithothamnion proliferum - Lithothamniaceae

Lithothamnion proliferum - Lithothamniaceae

Cyanobacteria - Red slime algae

Cyanobacteria - Red slime algae