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Photo
by Dr M Lueth ©.
*1: Silverwell, N. of Chacewater, 1919, FR (EXR) (Paton 1969a: 709).
*2: Hustyn Wood, 1876, RVT (CMM) (Paton 1969a:
709).
The taxonomic treatment of this form has been
controversial; it was treated as a distinct species by
Blockeel & Long (1998: 65) and Hill (in Smith 2004: 80),
as S. subsecundum subsp. inundatum by Daniels
& Eddy (1990: 143; cf. Eddy 1977), but as S. auriculatum var. inundatum by Hill
(1975). Species rank seems undeserved because Cornish material
of inundatum seems
poorly differentiated from S. auriculatum in both
morphology and ecology. Furthermore, enzyme data do not
support its recognition as a separate species (Krzakowa &
Melosik 2000, Brugués et al. 2004:
48).
To the non-specialist on sphagna this taxon appears
to be only a rather ill-defined var. of Sphagnum denticulatum, with some
material apparently linking them, at least in respect of the
extent of the fibrillose zone on the stem leaves. However, a
population SE. of Roche in wet GreyWillow
carr appears to be a mixture of both forms, with Sphagnum inundatum
possibly on slightly wetter areas. It was also mixed with S. denticulatum on very
wet heath with shallow water beside pools NE. of Bugle, S. inundatum growing
there at slightly higher levels than the S.
denticulatum.
(Pre-1993 records of this var. may include some
misidentified Sphagnum
denticulatum, fide J.A. Paton MS. note dated
1995).
Recorded from variety of wet, acidic sites on peat
or peaty substrates, mainly in open or lightly shaded; forms
small carpets or low hummocks. Most records are from hollows
in wet heaths or in mires (on open ground and on boggy
side-slope of valley), with several in wet areas in carr of
Grey Willow. Also recorded at edge of heathland pool, base of
Juncus and Molinia caerulea on
overgrown mire, in wet hollow among heaps of old mine-spoil
(E. of Goonhavern), wet hollows in china clay workings, flush
in pasture, in small quantity in extensive flush on slope
above sea-cliffs (N.of Morvah), and in shallow water in
hollows at base of flushed granitic crag, partly shaded by
deciduous woodland (Luxulyan Valley). Common associates
include Sphagnum
subnitens, Erica
tetralix, Molinia
caerulea, Ulex
gallii; frequent associates include Aulacomnium palustre,
Straminergon
stramineum, Sphagnum denticulatum,
Sphagnum
fimbriatum, Sarmentypnum
exannulatum, Erica
ciliaris and Schoenus
nigricans.
Occasionally [?] c.fr.: capsules dehisced
8.
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