Photo
by Dr M Lueth ©.
*1: Trengwainton nearPenzance, 1864, WC
(PNZ) (Paton 1969a:
754).
*2: St Nectan's Kieve,
Tintagel, 1886, HND (BM) (Paton 1969a:
754).
Plants intermediate between P. succulentum and P. nemorale occur in
Cornwall as elsewhere in
Britain and Ireland. A proportion of the intermediate plants
have some leaves on different branches of the same plant
showing characters of each species. However, the extreme forms
seem rather distinct and most gatherings can be assigned to
one or the other taxon even if this appears somewhat
arbitrary. Doubts thus remain about their taxonomic
distinctness.
Habitat notes from C&S are as follows.
Apparently prefers more basic substrates than those on which
P. succulentum often
occurs, although the two not infrequently grow close together.
Soil on banks or slopes, over exposed tree roots, or over
sloping rocks (granite, serpentinite) or soil on old walls, on
'hedges', in woodland, on ditch and streambanks, laneside
banks, in churchyards, on slopes above sea-cliffs, in light to
moderate shade. Floor of Grey Willow carrs e.g. under ferns.
With other bryophytes on damp shaded walls (e.g. on wall of
low bridge over stream, shaded by trees). Associates recorded
include Oxyrrhynchium
hians, Kindbergia
praelonga,
Fissidens bryoides var. bryoides, Hookeria lucens, Plagiomnium
undulatum,
Plagiothecium denticulatum var. denticulatum, Plagiothecium
succulentum.
Occasionally/frequently c.fr.: capsules immature 1,
3-7, 11, 12; dehiscing 1-3, 5-8, 10, 11, [12]; dehisced 1,
3-6, 10, 11.
