. Botany for agricultural students . Botany. 410 BRYOPHYTES (MOSS PLANTS) is much more complex than the oogonium of the algae. In the less lobed receptacles of the gametophores of the male plants {B, Fig. 363) occur the antheridia, consisting of a stalk and of a jacket of cells which encloses a mass of sperms as shown in Figure Fig. 365. — Highly magnified vertical sections through the expanded tops or receptacles of female gametophores of Marchantia, showing the sex organs and sporophytes. A, section through female gametophore, showing the archegonia (o), each of which consists of a nec
. Botany for agricultural students . Botany. 410 BRYOPHYTES (MOSS PLANTS) is much more complex than the oogonium of the algae. In the less lobed receptacles of the gametophores of the male plants {B, Fig. 363) occur the antheridia, consisting of a stalk and of a jacket of cells which encloses a mass of sperms as shown in Figure Fig. 365. — Highly magnified vertical sections through the expanded tops or receptacles of female gametophores of Marchantia, showing the sex organs and sporophytes. A, section through female gametophore, showing the archegonia (o), each of which consists of a neck and an expanded base called venter, in which the egg (e) is located B, section through a female gameto- phore, showing sporophytes (s), with their sporangia (h), stalks (0, foot (/), and also showing spores {i) escaping from the sporangium of the sporophyte at the left. Since the sperms are produced on one plant and the eggs on an- other, the sperms have a considerable distance to be carried to the eggs. The sperms are splashed about during heavy rains, and, when near an archegonium, they are attracted to the entrance in the neck by an attractive substance which diffuses out of the archegonium. The sperms swim down the canal in the neck of the archegonium and the first one reaching the egg fertilizes it. The fertilized egg or oospore remains where it was formed, be- gins to grow and divide rapidly, and soon produces an oblong, multicellular, brownish body which consists of a stalk that is attached to the receptacle by an absorbing organ called Joot and bears at the other end a sporangium {B, Fig. 365). The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
Size: 1965px × 1272px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
