Elementary botany . 7)ic, mother-cell of LIVER WOR TS : MA R CHA NTIA. 233 This shows us an increase in the size and complex structure ofthis new phase of the plant, the sporophyte. This is one of thevery interesting things which we have to note as we go on in thestudy of the higher Fig. polymorpha, archegonium at the left with egg; archegonium at the right withyoung sporogonium ; /, curtain which hangs down around the archegonia ; e, egg; v, venterof archegonium ; n, neck of archegonium ; sj>, young spoiogonium. 491. Sporophyte dependent on the gametophyte for its n
Elementary botany . 7)ic, mother-cell of LIVER WOR TS : MA R CHA NTIA. 233 This shows us an increase in the size and complex structure ofthis new phase of the plant, the sporophyte. This is one of thevery interesting things which we have to note as we go on in thestudy of the higher Fig. polymorpha, archegonium at the left with egg; archegonium at the right withyoung sporogonium ; /, curtain which hangs down around the archegonia ; e, egg; v, venterof archegonium ; n, neck of archegonium ; sj>, young spoiogonium. 491. Sporophyte dependent on the gametophyte for its nutri-ment.—We thus see that at no time during the development of thesporogonium is it independent from the gametophyte. This newphase of plants then, the sporophyte, has not yet become an in-dependent plant, but must rely on the earlier phase for sustenance. 492. Development of the sporogonium.—It will be interesting to notebriefly how the development of the marchantia sporogonium differs from thatof riccia. The first division of the fertilized egg is the same as in riccia, thatis a wall which runs crosswise of the axis of the archegonium divides itinto two cells. In marchantia the cell at the base develops the stalk, sothat here there is a radical difference. The outer cell form
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
