The Ultrastructure of Grateloupia filicina (Halymeniaceae, Rhodophyta) Pit Plugs
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Y.-C. Chen
Abstract
Cultured Grateloupia filicina was used as the material for observations on spore development and the ultrastructure of pit plugs. The general characteristics of the pit plugs were the same in the discs, filaments and frond-like thalli of this red alga. The pit plugs were naked (no cap layers) with a cap membrane and a plug core. The matrix was diffuse in the center and dense in the outer portion. However, the sizes and shapes of the pit plugs varied. Pit plugs of the filament-like medullary cells of the frond-like thalli were the largest. These pit plugs were H-shaped with a deep central constriction. Pit plugs of the filament cells, were bead-shaped and were smaller than those of the medullary ones. In contrast, pit plugs of the cortex of the frond-like thalli were the smallest. The pit plugs of disc cells and terminal ball-like structures on filaments, were a little larger than the cortex and filament cell pit plugs, and were roughly round-shaped, like those of the cortex. This study confirms that the pit plugs of red algal vegetative cells have taxonomic value, even among the same species in different growth phases.
Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Contents
- Author Index
- Taxonomical Index
- Subject Index
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- A Highly Methylated Agar from Red Seaweed, Gracilaria arcuata
- Effect of Nitrogen Loading on Enzyme Activity of Macroalgae in Estuaries in Waquoit Bay
- The Ultrastructure of Grateloupia filicina (Halymeniaceae, Rhodophyta) Pit Plugs
- Morphology and Taxonomy of Chaetoceros contortus Schütt 1895, with Preliminary Observations on Chaetoceros compressus Lauder 1864 (Subgenus Hyalochaete, Section Compressa)
- Ecology of Sargassum muticum (Phaeophyta) on the North Coast of Spain: IV. Sequence of Colonization on a Shore
- Pico- and Nanophytoplankton Assemblages in a Subantarctic Ecosystem: The Strait of Magellan
- Isolation and partial characterization of giraffine, a lectin from the Mexican endemic alga Codium giraffa Silva
- Two marine species of Cocconeis Ehrenberg (Bacillariophyceae): C. pseudomarginata Gregory and C. caribensis sp. nov.
- Studies on the Structure and Reproduction of Populations of Cystoseira indica (Fucales, Phaeophyta) from Pakistan
Articles in the same Issue
- Contents
- Author Index
- Taxonomical Index
- Subject Index
- Species of the Genus Thalassiosira (Bacillariophyceae) from the Gulf of Tehuantepec, Mexico
- Fungi on Juncus roemerianus 12. Two New Species of Mycosphaerella and Paraphaeosphaeria (Ascomycotina)
- A Highly Methylated Agar from Red Seaweed, Gracilaria arcuata
- Effect of Nitrogen Loading on Enzyme Activity of Macroalgae in Estuaries in Waquoit Bay
- The Ultrastructure of Grateloupia filicina (Halymeniaceae, Rhodophyta) Pit Plugs
- Morphology and Taxonomy of Chaetoceros contortus Schütt 1895, with Preliminary Observations on Chaetoceros compressus Lauder 1864 (Subgenus Hyalochaete, Section Compressa)
- Ecology of Sargassum muticum (Phaeophyta) on the North Coast of Spain: IV. Sequence of Colonization on a Shore
- Pico- and Nanophytoplankton Assemblages in a Subantarctic Ecosystem: The Strait of Magellan
- Isolation and partial characterization of giraffine, a lectin from the Mexican endemic alga Codium giraffa Silva
- Two marine species of Cocconeis Ehrenberg (Bacillariophyceae): C. pseudomarginata Gregory and C. caribensis sp. nov.
- Studies on the Structure and Reproduction of Populations of Cystoseira indica (Fucales, Phaeophyta) from Pakistan
