Enteromorpha intestinalis can be used for human consumption.To my knowledge, the other is not used for such a purpose,though both of them are green weeds.The former can also be used as feed for filter feeders,as well as an ingredient in fish & shell feeds.

Hi Prosenjit,

hope these links may of interest and of use. As far as India is concerned, in the southern coast, some groups eat Ulva after drying them. 

http://www.fao.org/docrep/006/y4765e/y4765e0b.htm

http://shodhganga.inflibnet.ac.in/bitstream/10603/5570/6/06_chapter%201.pdf

best regards

Deepak

In Europe Ulva can be consumed, probably more than Enteromorpha

In cooking recipes, talking to "sea lettuce" for Ulva and "sea hair" for  Enteromorpha

You may refer the following:

http://www.atomicshrimp.com/st/content/seaweed.

http://www.celtnet.org.uk/recipes/ancient/wild-food-entry.php?term=Gutweed.

www.fao.org/docrep/006/y4765e/y4765e0b.htm

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www.idosi.org/ajbas/ajbas1(5-6)09/3.pdf

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Both of them are consumed around the world

Some seaweeds are used directly , some consumed indirectly. Agar agar and many other components are also extracted form these weeds.

Not, Agar-Agar is only extracted from some rhodophytes, but not from Chlorophytes such as Ulva and Enteromorpha

Ulva can be consumed directly as salad and Entermorpha is used for BHUT CHATURDASI sak (According to Dr. Harekrishna Jana)

It is very difficult to identify the species of Ulva only by morphological characteristics. From the organoleptic and nutritional point of view all species are quite similar, just keep in mind that species called "enteromorpha" often tend to be in environments presumably contaminated or altered.

I agree with the comment of Paul Tompkins, now there is no Enteromorpha genera, that genera merged with Ulva and so Ulva lactuca and Ulva intestinalis are the species growing in the midlittoral region of lthe intertidal rocky surfaces. Both species widely used as food and fodder in several countries. we did some work on antimicrobial acitivity  of the these species against human pathogens