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This is a covered walkway that connects the bridge from the previous two photos with the main entrance of Bielefeld University, Germany. It's quite foggy so a lot of light is scattered before falling through the glass roofing from all angles. They have kind of an algae problem with this roof, also speaking to the quite humid climate Bielefeld is renowned for. Let's just hope the lunatics in the US Congress withstand reason long enough for things to just get a tiny bit more arid around here.
Coralline algae in Rose Atoll, located in National Marine Sanctuary of American Samoa. (Photo: Mark Manuel/NOAA)
Rough bubble Algae
Dictyosphaeria cavernosa
(Forsskål) Børgesen, 1932
Description:
The plant forms a large, green, hollow, nearly spherical mass that may be lobed or may collapse or rupture but continues to grow; up to 10 cm in diameter. The wall is crisp, crunchy and show large, angular cells. Differentiated from smooth bubble algae because of the visibility of individual cells (1 mm in size) that make up the algae. They form convoluted, hollow colonies of a continuous layer of green cells.
Habitat:
It grows in most reef environments, attached to rocky substrates and areas of dead coral. On occasion it covers extensive areas, especially under high nutrient levels.
Distribution:
South Florida, Bahamas and Caribbean.
Sources:
-http://species-identification.org/
-http://www.biol.andrews.edu/
Many species of algae competing for space at Olympic Coast National Marine Sanctuary.
Photo credit: Jenny Waddell/NOAA
San Diego, Mission Beach
Red algae
Plocamium cartilagineum
Plocamiaceae Family
Order:Plocamiales
Division: Rhodophyta
I am told it tastes like carrots!
Diatoms[1] are a major group of algae, and are one of the most common types of phytoplankton. Most diatoms are unicellular, although they can exist as colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stellate colonies (e.g. Asterionella). Diatoms are producers within the food chain. A characteristic feature of diatom cells is that they are encased within a unique cell wall made of silica (hydrated silicon dioxide) called a frustule. These frustules show a wide diversity in form, but usually consist of two asymmetrical sides with a split between them, hence the group name. Fossil evidence suggests that they originated during, or before, the early Jurassic Period. Diatom communities are a popular tool for monitoring environmental conditions, past and present, and are commonly used in studies of water quality. Some diatoms are capable of movement via flagellation.
What makes Rose Atoll in National Marine Sanctuary of American Samoa rosy? Coralline algae! Pink coralline algae dominates the atoll's fringing reef, giving the reef a rosy hue.
Photo Credit: Wendy Cover/NOAA