For instance, the green penny fern (Lemmaphyllum microphyllum), which attaches itself to rocks and tree trunks, has succulent, round "feeding leaves" which absorb nutrients, and also long, thin "fertile leaves" which are responsible for reproduction. The two look very different, and have different functions. They often mislead people into thinking they are seeing two different species of plant.
比如著生在石頭與樹幹上的伏石蕨，吸收養分的「營養葉」肥而圓，繁殖後代的「孢子葉」瘦而長，兩者長相互異，職司不同，常讓人誤以為是兩個不同種類。