First vice-county records for species as
a whole:
*1: Newlyn Cliff, 1875, WC (NMW) (Paton 1969a:
690).
*2: Red Moor, 1962, JAP (Paton 1969a: 690). [Older
report (Stream near Talland, FR, in Rilstone 1919), not
supported by specimen: Paton 1969a:
690].
Long (1995a) revised British records of each of the
three subspp. now recognised (for details of which see Paton
1999: 572). See below for records of each of subspp.
Marchantia polymorpha subsp. polymorpha
Marchantia polymorpha subsp. ruderalis
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