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Q: how is gametophyte of Marchantia sp. differ from the gametophyte of Polytrichum sp.?
A: You are asking for the defining characteristics of a liverwort Marchantia versus a moss Polytrichum. Liverworts come in two basic types; the leathery, lobed thalloid sheets and the leafy or moss-like gametophytes. [ Only the edges of liverwort leaves have lobes or points. The leaves are aligned in two rows along the stem. Moss leaf edges may be serrated but are never lobed. The majority are
smooth edged, all the same size, and are arranged in a spiral along the stem Only moss have phyllids (leaf-like flanges) with cells along the midline that have a facilitated internal osmosis of water: prevascular xylem-like hydroid cells and the phloem-like leptoid cells. Liverworts lack these cell types. ]
Expert answered|AngelInDisguise|Points 4364|
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Asked 2/16/2012 1:37:40 AM
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