Grimmia pulvinata

This moss can often be found on walls and concrete surfaces.
This cushion moss is cover with long hairs that gives it the.
grey color. This a very common cushion moss with a worldwide
distribution.

seize

The seize of this cushionmoss makes a big difference: As mosses
don't have an extensive roots system, they only depent on water
that they can store.
If they don't have any stored water
the moss won't die but cannot fotosynthesize. In this cushion moss
the larger the moss is the more water it can store and the longer
the fotosynthese can go on.

Grimmia pulvinata grows on concrete and lime underground.

Grimmia pulvinata can be found often together with wall screw-moss.
Tortula muralis or Wall screw-moss is often the first moss that
colonize a wall and is followed by Grimmia pulvinata.

Grimmia pulvinata on a concrete wall.

mosses or Bryophytes

These are small evergreen plants that can be found
on wet or damp shady places. They have a tiny root system
and reproduce by forming spores. Many mosses are less than
2cm long, very rarely more than 20 centimeter. Most mosses
can be found in the tropical regions, but mosses and
liverworts can even be found on Antartica.
The mosses are called Bryophytes and there are three divisions:
The mosses, liverworts, and hornworts
Mosses are different than the higher plants: mosses don't have
vasculair tissue. So the stems, leaves and roots contain no
vasculair tissue and are therefor not capable to transport large
amounts of fluids. Most mosses consist of haploid cells: cells that have only one
sample of every chromosome (this is written as n), all the higher
plants (and animals)have two samples of every chromosome,
written as 2n. Have a look at the reproduction of common hair cap:

Moss structures:

Roots
Mosses have small tiny basal processes which
have the function and as roots, but have more the function
rhizoid holdfasts, they are called rhizomes.
Leaves
The leaves of roots don't contain vasculair tissue and are only
one cell thick, they are called phyllids,
The stem
The stem don't contain vasculair tissue or , but have
hydroid cells that store water.The stem is also called
shoot.
This website shows the common mosses:

Cyress-leaved plait-moss
Rough-stalked feather-moss
common hair cap
Grimmia pulvinata

Growing on a wall

These plants grow on chalcky old walls.

Wall-rue (Asplenium ruta-muraria)
Maidenhair spleenwort (Asplenium trichomanes)
Tongue fern (Asplenium scoloendrium)
Red valerian (Centranthus ruber)
Sticky Hornweed (Cerastium glomeratum)
Kenilworth Ivy (Cymbalaria muralis)
Fleabane (Erigeron karvinskianus)
Herb Robert (Geranium robertianum)
Purple Toadflax (Linaria purpurea)
Sweet Alyssum (Lobularia maritima)
Wall pepper (sedum acre)
wall lettuce (Mycelis muralis)
sticky-weed (Parietaria judaica)
Red valerian
Yellow Corydalis (Pseudofumaria lutea)
Sempervivum (sempervivum)
Wallflower (Erysimum cheiri)

(Grimmia pulvinata)
Rough-stalked feather-moss (Brachythecium rutabulum)

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