A gemma (plural gemmae) is a single cell, or a mass of cells, or a modified bud of tissue, that detaches from the parent and develops into a new individual. This type of asexual reproduction is referred to as fragmentation. It is a means of asexual propagation in plants. These structures are commonly found in fungi, algae, liverworts and mosses, but also in some flowering plants such as pygmy sundews and some species of butterworts. Vascular plants have many other methods of asexual reproduction including Bulbils and Turions.
In mosses and liverworts
The production of gemmae is a widespread means of asexual reproduction in both liverworts and mosses. In liverworts such as Marchantia, the flattened plant body or thallus is a haploid gametophyte with gemma cups scattered about its upper surface. The gemma cups are cup-like structures containing gemmae. The gemmae are small discs of haploid tissue, and they directly give rise to new gametophytes. They are dispersed from gemma cups by rainfall.
- "Pygmy Sundew Gemmae". Pygmy Sundew Gemmae. Cascade Carnivores. 2011. Retrieved December 14, 2011.
- Hughes, Stanley John. On conidia of fungi, and gemmae of algae, bryophytes and pteridophytes. NRC Research Press.
- Smith, AJE (1989) The Liverworts of Britain and Ireland, Cambridge University Press, Cambridge.
- Marchantiales - diagrams and micrographs of liverwort gemmae
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