- Porella platyfolia (Flat leaved Scale Moss)
Bryophyta is the phylum name for the Mosses
and Liverworts. They are all fairly small plants which have no internal
tissue for conducting water along their stems, as the flowering plants
and ferns have. Though its English name suggests that it is a moss,
it is a member of the Hepaticae or Liverworts. Unlike the mosses,
liverworts do not have stems with leaves with midribs, but consist
of little more than a leafy frond. They do not have flowers, but very
occasionally have a tiny spore capsule on a slender stalk. They do
need to grow in places where there is a constant supply of water or
a moist atmosphere, and often alkaline conditions. This species,Porella
platyfolia (which means broad leaved), growing at Hughenden Manor,
grows on a north facing flint wall along a sunken roadway so it never
has direct sunlight and therefore remains damp.
Other liverworts which are farly common are Marchantia polymorpha
and Pelia epiphylla which are less leaf-like, rather flattened fronds.