. A manual of botany. Botany. 58 MANUAL OF BOTANY Fig. 806. The reproductive processes of the group may be sexual or asexual. The sexual cells are usually all alike and are free- swimming ciUated gametes, which conjugate in pairs. Vau- cheria is exceptional in producing anthe- ridia and oogonia {fig. 805), which are de- veloped in close prox- imity to each other from the surface of a filament. Each be- comes shut off from the rest of the coeno- cyte by a cell-wall. The antheridium gives rise to a number of antherozoids which are liberated by the rupture of the apex. The oogonium contains a sin
. A manual of botany. Botany. 58 MANUAL OF BOTANY Fig. 806. The reproductive processes of the group may be sexual or asexual. The sexual cells are usually all alike and are free- swimming ciUated gametes, which conjugate in pairs. Vau- cheria is exceptional in producing anthe- ridia and oogonia {fig. 805), which are de- veloped in close prox- imity to each other from the surface of a filament. Each be- comes shut off from the rest of the coeno- cyte by a cell-wall. The antheridium gives rise to a number of antherozoids which are liberated by the rupture of the apex. The oogonium contains a single oosphere, and when it is mature it opens at the apex, and a drop of muci- lage is extruded. An antherozoid enters the oogonium and. Fi(j. 806. Fart of a filament of Ulo/hrix Irom which tlie gametes, g, are escaping. g\ Free gametel (/\ &'. Gametes conjugating. Fig. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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