Langer, Jackelyn (2012) Anthocerotophyta, bryophyta and marchantiophyta (plant division). White Word Publications, Delhi, India. ISBN 9788132340850
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Abstract
Hornworts are a group of bryophytes, or non-vascular plants, comprising the division Anthocerotophyta. The common name refers to the elongated horn-like structure, which is the sporophyte. The flattened, green plant body of a hornwort is the gametophyte plant. Hornworts may be found worldwide, although they tend to grow only in places that are damp or humid. Some species grow in large numbers as tiny weeds in the soil of gardens and cultivated fields. Large tropical and sub-tropical species of Dendroceros may be found growing on the bark of trees. The plant body of a horwort is a haploid gametophyte stage. This stage usually grows as a thin rosette or ribbon-like thallus between one and five centimeters in diameter. Each cell of the thallus usually contains just one chloroplast per cell. In most species, this chloroplast is fused with other organelles to form a large pyrenoid that both manufactures among algae and stores food. This particular feature is very unusual in land plants, but is common. Many hormworts develop internal mucilage-filled cavities when groups of cells break down. These cavities are invaded by photosynthetic cyanobacteria, especially species of Nostoc. Such colonies of bacteria growing inside the thallus give the hornwort a distinctive blue-green color. There may also be small slime pores on the underside of the thallus. These pores superficially resemble the stomata of other plants.
| Item Type: | Book |
|---|---|
| Subjects: | S Agriculture > SB Plant culture |
| Divisions: | Electronic Books |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 02 Jan 2023 01:22 |
| Last Modified: | 02 Jan 2023 01:22 |
| URI: | http://odlsystem2.utm.my/id/eprint/3823 |
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