What Is a Rhizoid? Root Like Threads on Mosses
A rhizoid is a fine thread on the underside of a moss or liverwort that anchors it to soil, bark or rock. The University of Connecticut notes rhizoids look similar to the root hairs of higher plants plus adhere the moss to its substrate.
The short answer
Rhizoids anchor plants with no true roots. UConn notes rhizoids look like root hairs plus act to attach moss to its surface, with a role in water intake as well. NC State Extension notes numerous rhizoids attach the common liverwort thallus to the soil. Bryophytes have no xylem or phloem.
What does a rhizoid do?
UConn notes rhizoids adhere moss to the substrate plus play a part in water intake. NC State notes rhizoids fix the liverwort thallus to soil.
How is a rhizoid different from a root?
NC State notes bryophytes such as moss plus liverworts lack xylem plus phloem, the internal tissue that carries water in other plants. Roots have that tissue. NC State notes root hairs on vascular plants are outgrowths of epidermal cells where most water plus nutrients enter.
| Feature | Rhizoid | Root hair |
|---|---|---|
| Found on | Moss plus liverworts | Vascular plants |
| Main role | Anchoring | Water intake |
| Vascular link | None | Joins xylem |
| Look | Fine threads | Fine outgrowths |
| Source | UConn plus NC State | NC State |
| Life span | Not given | Days to weeks |
Source: University of Connecticut plus NC State Extension.
Which plants have rhizoids?
UConn notes rhizoids on moss. NC State notes them on the common liverwort, Marchantia polymorpha. Iowa State University Extension notes moss does not harm other plants, so rhizoids in a lawn or bed are not a threat to nearby plants.
How to: step by step
- Lift a small piece of moss.
- Turn it over to the underside.
- Look for thin brown threads.
- Note how they grip the soil or bark.
- Compare them with root hairs on a seedling.
- Set the moss back in place.
Troubleshooting
Moss lifts easily: weak grip. UConn notes rhizoids adhere moss to its surface.
Confused with roots: no vascular tissue. NC State notes bryophytes lack xylem plus phloem.
Threads on a liverwort: normal. NC State notes numerous rhizoids attach the thallus.
For roots see cannabis root hairs plus cannabis leaf anatomy. Read companion plants when growing marijuana plus the effects of environmental stresses on weed plants. Kind Seed Co also stocks cannabis seeds.
Sources
- A visit to the miniature forest (mosses), University of Connecticut Bryology
- How to manage moss in the lawn and garden, Iowa State University Extension
- Marchantia polymorpha (common liverwort), NC State Extension Gardener Plant Toolbox
- Extension Gardener Handbook, chapter 3: botany, NC State Extension
FAQ
Do rhizoids take in water?
The University of Connecticut notes rhizoids adhere moss to its surface plus play a part in water intake.
Do liverworts have rhizoids?
Yes. NC State Extension notes numerous rhizoids attach the common liverwort thallus to the soil.
Does moss harm other plants?
Iowa State University Extension notes moss does not harm other plants.
Are rhizoids the same as root hairs?
No. UConn notes they look similar to root hairs, but rhizoids sit on moss while root hairs grow on the roots of vascular plants.
Do mosses have xylem?
No. NC State Extension notes bryophytes have no xylem or phloem plus no internal water system.
