Found throughout most of the world, you probably have encountered this fellow many times in your life, but did not pay any attention. After all, it is just a moss!
Scientifically known as Bryum argenteum and popularly named silvergreen moss, this tiny little fellow lives on cracks of stones, walls and sidewalks, thus it is also known as sidewalk moss. It usually forms small lumps composed by many plants growing tightly together. The small leaves of each plant are also tightly packed together, giving it the appearance of a small piece of wool thread. The tip of the plant usually have a silver tinge that may be more or less intense, hence the name silvergreen moss.
As with all mosses, the green tapestry that forms the main part of the silvergreen moss are gametophytes, haploid organisms that are either male or female. The males produce a male gamete that swims towards a female plant and fertilizes its gamete. As a result, a new sexless plant grows on the top of the female, the so-called sporophyte. You can see the sporophytes as small stalks with a bag on the end.
Extracts of the silvergreen moss has shown antimicrobial activity, being effective against several species of bacteria and fungi, making it a promising candidate for the development of new medicines.
Living from the poles to the equator, the silvergreen moss has a huge ability to adapt to extremes of temperature, humidity and altitude. It also shows a considerably high tolerance to heavy metals, and that is most likely the reason why it is so common along roads.
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EOL – Encyclopedia of Life. Bryum argenteum. Available at < http://eol.org/pages/864280/overview >. Access on September 29, 2016.
Sabovljevic, A., Sokovic, M., Sabovljevic, M., & Grubisic, D. (2006). Antimicrobial activity of Bryum argenteum Fitoterapia, 77 (2), 144-145 DOI: 10.1016/j.fitote.2005.11.002
Shaw, A., & Albright, D. (1990). Potential for the Evolution of Heavy Metal Tolerance in Bryum argenteum, a Moss. II. Generalized Tolerances among Diverse Populations The Bryologist, 93 (2) DOI: 10.2307/3243622
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