A Somerset Heath and its Bryophytic Zonation. 89 
J uncus sylvaticus a 
Eleocharis multicaulis o 
Carex paniculata I 
„ pulicaris o 
,, fulva o 
„ echinata o 
,, oederi a 
,, inflata I 
Hypnum intermedium d 
,, giganteum f 
„ scorpioides form o 
H. level veils f 
H. cuspidatum o 
Milium affine var. elatum o 
Bryum pseudotriquetrum o 
The dominant Hypnum is Hypnum intermedium, but it is often 
associated with other Hypna, these associates forming a mossy 
carpet in which the vascular plants are sprinkled. H. cuspidatum 
and Mnium affine var. elatum may occur, but they are more frequent 
in a slightly higher zone or in the flatter lower portion of the heath. 
Fig. 7. A, B, Calypoegiu fissa (L.) Raddi, two plants from the heath - A, a 
nearly typieal plant though rather elongated; B, a slender form found in 
shadier and more aquatic situations. C, D, Hypnum scorpioides L. : — C, typical 
plant with a reddish colour, from 11 C. ; D, slender green form from IV B. 
(see Text). Plant in each case x 2 ; part of plant, or leaf, x 15. 
H.giganteum, which bears a superficial resemblance to H .cuspidatum 
but has nerved leaves, occasionally forms an outward fringe to the 
H. intermedium. The form of H. scorpioides occurring in this zone 
(Pig. 7, D) differs from the normal plant found in II B in the more 
erect habit, the slenderer shoots, the smaller, greener and less rugose 
leaves and seems to be a state due to severer competition and 
reduction of light by its associates. 
V. Zone of Hypnum cuspidatum. This is seldom distinguish¬ 
able from the last zone, but sometimes the Hypnum cuspidatum 
