Laminaria: Features, Occurrence, Structure, Reproduction
2023年1月17日 · The sporophytic thallus is differentiated externally into three distinct parts: a holdfast, stipe, and blade (lamina). The holdfast may be a solid disc-like structure. But it usually consists of forked root-like branches called heptera. Holdfast attaches the plant body to the substratum. The stipe develops on the holdfast.
Life Cycle Laminaria (With Diagram) | Algae - Biology Discussion
The alga is characterized by a conspicuous sporophyte, which may be even six feet or more in length consisting of a basal discoid or branched holdfast, a stipe, and a lamina which is simple or digitate (Fig. 106A). Growth occurs at intercalary meristem, usually located between the lamina and the stipe (Fig. 106B).
Laminaria: Occurrence, Features and Reproduction - Biology …
The plant body of Laminaria is diploid and attains a length of 2 to 12 metre or more in length. The sporophytic plant body is differentiated into holdfast, stipe and blade (lamina) (Fig. 3.123). Holdfast:
Laminaria - Wikipedia
Laminaria expresses a haplo-diplophasic life history, in which it alternates from a macroscopic thallic sporophyte structure, consisting of the holdfast, a stipe, and the blades, to a filamentous, microscopic gametophyte.
Kelp: Laminaria, a brown algae – Inanimate Life - Geneseo
Typical of most brown algae Laminaria is truly multicellular, and has three distinct multicellular organs: a holdfast, that attaches the organism to a substrate, a broad flat blade that carries out the bulk of photosynthesis, and a stipe (stalk) that connects the blade to the holdfast and is long enough to allow the blade to obtain light. Many ...
Holdfast - Master Gardeners of Northern Virginia
At 3–13 feet tall, Laminaria digitata (horsetail kelp, oarweed) can be the dominant alga in these meadows and their holdfasts provide refuge to a wide variety of crevice dwelling species.
Holdfast - an overview | ScienceDirect Topics
The ‘typical’ laminarian holdfast structure is illustrated by (A) Laminaria ochroleuca (example shown from Plymouth, UK), which is often colonised by a rich and abundant sessile invertebrate assemblage, and (B) Laminaria pallida (South Africa), which provides a highly complex and intricate microhabitat for associated organisms.
Laminaria - an overview | ScienceDirect Topics
Laminaria thalli can be divided into holdfast, stipe (stems), and lamina (blades). The holdfast may be a solid disc or a branched cluster of cylindrical heptra to ensure its firm attachment to the substratum.
2.27: Kelp - Laminaria, a brown algae - Biology LibreTexts
2021年10月13日 · Typical of most brown algae Laminaria is truly multicellular, and has three distinct multicellular organs: a holdfast, that attaches the organism to a substrate, a broad flat blade that carries out the bulk of photosynthesis, and a stipe (stalk) that connects the blade to the holdfast and is long enough to allow the blade to obtain light. Many ...
Study of the fauna inhabiting the holdfasts of Laminaria …
1980年10月1日 · A survey of the holdfast fauna of Laminaria hyperborea was carried out at thirty-five sites around the UK, mostly along the North Sea and south coasts. Data from different age classes of holdfast from a polluted and unpolluted site indicate that volume of holdfast space is a most important measurement of sample size, a minimum size of sample ...