Nostoc is a kind of wild algae . Black，The form is long and thin like people?s hair. It?s nutritious. It is the nutritive value and medical value higher wild edible algae，Nostoc includes protein 20%, iodine 1.1%.It is the rare delicious food on the feast. It can cure high blood pressure, gynecological diseases, etc. Nostoc produced of the Inner Mongol is in large quantity，high quality ，in great demand and domestic and international. It is limited in output because it grows sticking to the ground，Gather more will destroy the water and soil of the earths surface too much，Unfavorable environmental protection. Therefore, China government has forbidden its being collected and being sold in the market.