Noun:

1. type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce

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1. Studies on the chemical constituents of Ulva lactuca L.
   石莼的化学成分。
2. Results show that Ulva P.K.Can uptake ammonia,nitrite,nitrate and phosphorus simultaneously.Ammonia removal is efficient,but the changes of COD is minimal.
   结果表明，孔石莼能同时吸收水中的三氮和磷酸盐，尤其对氨氮有极强的吸收作用，但对有机物的去除不明显。