Organography of plants, especially of the archegoniatae and spermaphyta . sporophytes capable ofvegetative multiplication, and the sexual reproduction is, although greaterthan w^as formerly believed, relatively subordinate, and these forms wouldnot disappear from the earth even if their gametophyte were entirelysuppressed. ^ See p. 213. RELATIONSHIPS OF SYMMETRY OF THE PROTHALLUS 191 2. RELATIONSHIPS OF construction of the prothalli only seldom occurs, and in thisthe Pteridophyta resemble the Hepaticae. It is found in Lycopodium,Ophioglossum pedunculosum, and in the archegoniop
Organography of plants, especially of the archegoniatae and spermaphyta . sporophytes capable ofvegetative multiplication, and the sexual reproduction is, although greaterthan w^as formerly believed, relatively subordinate, and these forms wouldnot disappear from the earth even if their gametophyte were entirelysuppressed. ^ See p. 213. RELATIONSHIPS OF SYMMETRY OF THE PROTHALLUS 191 2. RELATIONSHIPS OF construction of the prothalli only seldom occurs, and in thisthe Pteridophyta resemble the Hepaticae. It is found in Lycopodium,Ophioglossum pedunculosum, and in the archegoniophore of some species ofTrichomanes. The prothalli of Filicineae and Equisetaceae are markedlydorsiveniral. The relationships to light of the dorsiventrality of the prothalliof Filicineae has been already explained ^ ; but dorsiventral construction isalso known in cases where there can be no effect of light, for example inthe male prothalli of Salvinia, Isoetes, Marsilia, and in hypogeous prothalli ofBotrychium virginianum. We cannot say whether in such cases we have to.
Size: 1712px × 1460px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookido, booksubjectplantanatomy
