Red & Purple Algae

Red & Purple Algae
Red & Purple Algae

Red algae actually vary in color from straw-yellow to deep-purple or black in appearance.

Agardh's Red Weed - Agardhiella subulata is very common and grows in tufts and clumps to about 12" in sunny shallow areas.

Laver or Porphyra ( above ) is similar to Ulva in many ways, although unrelated. It grows interspersed with Ulva in shallow sunny areas, and like Ulva, it is edible.

Red & Purple Algae
A common purple type known as Dasya or Chenille Weed.

2016 Update

Well, computers, you can bet that everything has changed here.


software

There are a number of computer software packages available that allow you to simulate different dive profiles and create custom decompression tables without actually going in the water. Most of them have graphical interfaces, and allow you to vary not only the dive profile, but gas mixes, decompression mixes, decompression stops, algorithm, conservatism, and many other factors. Software like this is a staple in the technical diving field but is also useful to the recreational diver. Here are a couple, with links:

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