. Plants and their uses; an introduction to botany . duces all the rest of theplant, the pseudo-leaves {b-h) which project from the lower surfaceof the thallus and hold water for it, and archegonia, very young (a)and full grown (a), ready for fertilization. (Waldner, Kny.) Both generations are still more highh developed in the umbrella-liverwort (^larchantia, Figs. 340-342), a common species growing onthe earth in moist localities. The spores germinate much as inRiccia, but the thalli are alwajs bisexual. At first, however, bothforms are essentially alike and resemble a brood-lolled Riccia. Fr
. Plants and their uses; an introduction to botany . duces all the rest of theplant, the pseudo-leaves {b-h) which project from the lower surfaceof the thallus and hold water for it, and archegonia, very young (a)and full grown (a), ready for fertilization. (Waldner, Kny.) Both generations are still more highh developed in the umbrella-liverwort (^larchantia, Figs. 340-342), a common species growing onthe earth in moist localities. The spores germinate much as inRiccia, but the thalli are alwajs bisexual. At first, however, bothforms are essentially alike and resemble a brood-lolled Riccia. Fromthe under side numerous unicellular pseudo-roots and manyscale-like pseudo-leaves. On the upper surface are often formednumerous brood-bodies of the form shoA\Ti in Fig. 342, which areproduced at the bottom of Uttle cups the whole suggesting a minia-ture nest full of eggs. By this peculiar form of vegetative reproduc-tion the gametophyte is rapidly multiplied; for as soon as a brood-^ Ca-lyptra < Gr. kabjptra, a veil. 516 LIFE-HISTORIES. Fig. 340, I.—Unil)rclla-livcr\vort {Marcfmntia polymorpha, Umbrolla-livcrwort Family, Marchantiacece). Male plant bearing antheridia-carricrs (anthcridiophores) f. (Atkinson.)—The plant is common onmoist earth, rocks, etc., throughout the world. _<iSRB&SssB»^
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
