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- Title
ON THE LIFE HISTORY OF MONOSTROMA FUSCUM (POSTELS ET RUPRECHT) WITTROCK.
- Authors
Dube, Maurice A.
- Abstract
Results of the study of Monostroma fuscum from San Juan Island, Washington, fully support the separation of the species M. fuscum from Monostroma sensu Wittrock into a taxon including M. obscurum. It would appear from this and previous studies that the M. obscurum-M. fuscum complex is clearly Ulvaeean. The characteristics of the complex include (1) alternation of morphologically similar haploid and diploid generations; (2) production of biflagellate gametes and quadriflagellate zoospores; (3) a uniseriate form in early ontogeny; (4) thallus development progressing through a vesicular stage that, as a result of localized degenerative processes, opens at a size of less than 1 cm into a monostromatic blade; (5) cells elongated perpendicular to the plane of the thallus and with rotund-truncate ends; (6) a single elongate plastid, thickened at the opposite poles of the cell and thinner in the equatorial region of the cell; (7) a thallus composed of cells with relatively inelastic walls; and (8) discrete discharge pores. The chromosome number of Monostroma fuscum is n = 9. The first division of the zoosporangium nucleus is meiosis I.
- Subjects
LESSONIACEAE; POSTELSIA; ZOOSPORES; HAPLOIDY; PLOIDY
- Publication
Journal of Phycology, 1967, Vol 3, Issue 2, p64
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.1529-8817.1967.tb04632.x