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What is the Difference Between Lichen and Moss?

A layer of moss.
Moss on stones around a waterfall.
A microscope is often needed to tell the difference between lichen and moss.
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  • Written By: Mary McMahon
  • Edited By: Niki Foster
  • Last Modified Date: 17 March 2014
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Mosses and lichens are often confused, in part because many common names for lichens include the word “moss.” In fact, the two organisms are radically different and are not even in the same kingdom. Both are fascinating organisms, often overlooked because they are small and not very showy. They grow all over the world and are used for dyes, animal fodder, ornamentation, medicines, and religious practices.

Lichens are perhaps the most amazing living things on Earth, because they represent a symbiotic relationship between a fungus and either algae or cyanobacteria. The symbiotic nature of lichen was not fully understood until the 19th century, when the idea was first proposed. They form a fascinating example of cooperative relationships in nature, with the fungus using the algae or bacteria to produce energy, while the algae or bacteria enjoys the protection the fungus provides.

These organisms reproduce in several ways. Many produce spores that attempt to capture partner algae or bacteria, while others reproduce through fragments of the lichen that break off and scatter. They can grow almost anywhere in the world, from extremely acidic soil to freezing arctic conditions, and are found growing on trees, rocks, and everything in between. Contrary to popular belief, the lichens that colonize trees, such as members of the Usnia family, are not harmful to their hosts, and in fact, they often capture valuable nutrients.

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Lichens take three forms. Crustose lichens, often found growing on rocks, are characterized by a crusty appearance. They are often vividly colored and create the bright streaks seen on rocks from a distance. Foliose lichens are leafy or stringy and are often found growing on the ground or around trees. Fruticose lichens form stalks, which sometimes form bright fruiting bodies.

Most observers don't even notice the small and ubiquitous lichen, but a determined searcher can find hundreds of species on a short walk in any region, from the depths of the woods to the streets of a major urban area. They can be extremely difficult to properly identify, often requiring the use of a microscope and specialized staining to discover the mingled identities coming together to make the lichen.

Moss, on the other hand, is a plant. It belongs to the bryophyta division, which is one of the most genetically diverse on Earth, including 10,000 species in 700 genera. These organisms can be found all over the world as well, and they form a major part of many ecologies by holding back erosion, retaining water, and feeding many animal and insect species. Moss is an archaic non-vascular plant, meaning that it has been around in various forms for millions of years, and it reproduces by casting out spores. Like lichen, it can also reproduce from broken off parts of the parent plant.

Physically, these two organisms can be difficult to distinguish. In general, mosses are green, grow in moist dark areas, and have small leaf-like structures, in addition to stems. Lichens often appear grey or pale white in appearance, and many also create disc-shaped fruiting bodies.

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Discuss this Article

anon290316
Post 5

I found all the information very interesting. I will add one more comment about lichens that they are good pollution detectors. They grow only in a clean environment free of lead. They develop slowly, only 3 mm every year. I will think twice before I burn it or remove it from its habitat!

anon212575
Post 4

This is good for my science homework tonight.

FirstViolin
Post 3

I know that a lot of people only think of buying moss for decorating, or ways to get rid of lichen clinging to their home, but I really think that these two cryptograms are so fascinating.

For instance, did you know that lichen and moss both existed before humans? That puts a whole new spin on their look. Before I knew that, I always thought of lichen and moss as just another plant -- the wall flowers of the plant world, as it were -- but once you realize how old they are, they start to look kind of cool and primeval.

It's also interesting to see how lichen and moss play a role in the ecosystem. For example, one of the main sources of nutrition for reindeer is lichen. Likewise, sheet moss can help provide nesting material as well as a shelter for smaller animals. Not to mention that both dried lichen and moss are great fire-starters when you're camping.

So I'm really glad that you wrote this article. These two amazing entities are all too often under-appreciated, and I think you did a great job of bringing out some of the more interesting aspects of lichen and moss.

naturesgurl3
Post 2

I'm so glad that you mentioned all these fascinating facts about lichen. It's so easy to get caught up in only moss, since it's more common in some areas, and moss pictures generally look prettier than those of lichen. But knowing all this information about lichens makes them so much more interesting!

Thanks for not getting caught up in the moss bias -- I really enjoyed this article as a result.

galen84basc
Post 1

Wow -- I had no idea there was so much to know about lichen and moss. We have a ton of lawn moss on my property, and I always kind of overlooked it, since it's just always there, but now I'm really interested in identifying it and learning more about it.

Could you give me some good tips for identifying lichen and moss, and what basic structures or types I should be looking for? Also, is it possible to identify most species of lichen and moss without advanced equipment like a microscope? Would a magnifying glass work, or does lichen and moss identification require more high-powered equipment?

This would be a great science project to do with my kids, thanks so much for the inspiration!

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