The fine structure of motile cells in the generaUlvaria andMonostroma,with special reference to the taxonomic position ofMonostroma oxyspermum (Ulvophyceae,Chlorophyta) |
| |
Authors: | Charles J. O'Kelly Gary L. Floyd Maurice A. Dube |
| |
Affiliation: | (1) Department of Botany, Ohio State University, 1735 Neil Avenue, 43210 Columbus, OH, USA;(2) Department of Biology, Western Washington University, 98225 Bellingham, WA, USA |
| |
Abstract: | The zoospores and isogametes ofUlvaria obscura var.blyttii, the isogametes ofMonostroma bullosum, and the anisogametes ofM. grevillei have a flagellar apparatus with counterclockwise absolute orientation and terminal caps, and therefore belong to theUlvophyceae. On the basis of the absence or presence of body scales and the morphologies of certain flagellar apparatus components,Ulvaria obscura var.blyttii is retained in theUlvales, whileM. bullosum, M. grevillei andM. oxyspermum are referred to theUlotrichales. Differences in scale morphology, certain flagellar apparatus components, and early thallus ontogeny support the transfer ofM. oxyspermum to the genusGayralia. Mating structures and their positional relationships within the cell are described from the gametes examined. A plasmalemma-associated plaque that may be a degenerate mating structure occurs in someG. oxysperma motile cells. |
| |
Keywords: | Chlorophyta Gayralia Monostroma M. bullosum M. grevillei M. oxyspermum Ulvaria U. obscura var.blyttii Ulvophyceae Flagellar apparatus absolute orientation mating structure terminal cap proximal sheath |
本文献已被 SpringerLink 等数据库收录! |
|