石莼科的模式属；绿色海藻具有两个细胞厚度的叶状体；海莴苣。
Type genus of the family ulvaceae; green seaweed having a thallus two cells thick: sea lettuce.
现在菜园里出产丰富而且不怕鸟来，许多菜畦分种着莴苣、卵形马铃薯、酸模、芜菁、萝卜和其他十字花科的植物。
The kitchen garden, now well stocked and carefully defended from the birds, was divided into small beds, where grew lettuces, kidney potatoes, sorrel, turnips, radishes, and other coneiferae.
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