. The algae. Algae. H ?mmr G 55Zt Fig. 62. Mougeotia. A-E, M. mirabilis, stages in conjugation through loss of cell wall. F, normal conjugation in M. mirabilis. n =new walls cutting off zygote. G-I, stages in lateral conjugation of M. oedogonioides. J, two azygotes in M. mirabilis. (A-F, after Czurda; G-I, after Fritsch; J, after Kniep.) Mesotaeniaceae: Mesotaenium (meso, middle; taenium, band). Fig. 63 This is an example of one of the saccoderm desmids, which as a group are characterized by a smooth wall in one complete piece and without any pores. The rod-shaped cells of Mesotaenium are sing
. The algae. Algae. H ?mmr G 55Zt Fig. 62. Mougeotia. A-E, M. mirabilis, stages in conjugation through loss of cell wall. F, normal conjugation in M. mirabilis. n =new walls cutting off zygote. G-I, stages in lateral conjugation of M. oedogonioides. J, two azygotes in M. mirabilis. (A-F, after Czurda; G-I, after Fritsch; J, after Kniep.) Mesotaeniaceae: Mesotaenium (meso, middle; taenium, band). Fig. 63 This is an example of one of the saccoderm desmids, which as a group are characterized by a smooth wall in one complete piece and without any pores. The rod-shaped cells of Mesotaenium are single, have no median constriction, and are circular in transverse section. The chloroplast in this particular genus is a flat axile plate containing several pyrenoids, whilst in some species the presence of phycoporphyrin imparts a violet colour. The inner cell wall is composed of cellulose and the outer of pectose. Multiplication takes place by cell division, the daughter cells being liberated by dissolution of the middle lamella after a constriction has been formed, though in some cases this may not occur until a number of cells have been enclosed in a common mucilaginous envelope. Sexual reproduction is by means of conjugation, two processes being put out just as in the filamentous forms: these unite and then III. 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
Size: 1379px × 1812px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
