J. Brodie et al., A reappraisal of Porphyra and Bangia (Bangiophycidae, Rhodophyta) in the northeast Atlantic based on the rbcL-rbcS intergenic spacer, J PHYCOLOGY, 34(6), 1998, pp. 1069-1074
Sequence data of the rbcL-rbcS noncoding intergenic spacer of the plastid g
enome for 47 specimens of Porphyra and Bangia from the northeast Atlantic r
eveal that they fall into II distinct sequences: P. purpurea, P. dioica (in
cludes a sample of P. "ochotensis" from Helgoland), P. amplissima (includes
P. thulaea and British records of P. "miniata"), P. linearis, P. umbilical
is, P. "miniata'', B. atropurpurea s.l. from Denmark and B. atropurpurea s.
l, from Wales, P, drachii, P, leucosticta (includes a British record of P.
"miniata var. abyssicola"), and P. "insolita" (includes P. "yezoensis" from
Helgoland). Of these, data obtained for P. purpurea, P. dioica, P. ampliss
ima, P. linearis, P. umbilicalis, P. drachii, and P. leucosticta were based
on type specimens or material compared with types. Comparison of sequence
data for Porphyra spp. and Bangia atropurpurea s.l. (including B. fuscopurp
urea, the type species of Bangia) confirms that the species are congeneric.
The data also confirm that the number of layers that make up the Porphyra
thallus are not taxonomically significant. Comparison of sequence darn for
species fi om the northeast Atlantic with those for material of two species
from the Pacific reveals that the species fall into two distinct groupings
: an Atlantic group, containing P, purpurea, P. dioica, P. amplissima, P. l
inearis, P. umbilicalis, P. "miniata", and B. atropurpurea, and a Pacific g
roup, containing P. "pseudolinearis", P. drachii, P. leucosticta, P. "yezoe
nsis'' (including a sample of P. "tenera"), and P. insolita" (including P.
"yezoensis" from Helgoland). The possibility of alien species in the northe
ast Atlantic is discussed.