Fróðskaparrit - 01.01.2001, Page 30

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THE BANGIOPHYTE SPECIES OF THE FAROEISLANDS
1725, 1726, 1730, 1731, 1737.
Sublittoral, 5-25 m depth.
Remarks: collected in May-August. Epiphytic on Cal-
lophyllis laciniata (Huds.) Klitz., Dilsea carnosa
(Schmidle) Kuntze, Odonthalia dentata (L.) Lyn-
gb., Desmarestia aculeata, blade of Laminaria hy-
perborea (Gunnerus) Foslie, and on Modiolus
modiolus L.
Morphology: blade one cell thick, ovate, arising from a
cushion of cells. Blade sometimes microscopic.
Herbarium specimens: pink-mauve, transluscent.
Porphyrostromium boryanum (Mont.) Tre-
vis.
Erythrotrichia boryana (Mont.) Berthold.
Reference: Kornmann (1984) as Erythrotrichopeltis
boryana (Trevis.) Kornmann.
Remarks: recorded by Irvine (1982) but has not been
confirmed nor collected since.
Stylonema alsidii (Zanardini) K.M.Drew
Goniotrichum alsidii (Zanardini) M.Howe.
Reference: Bird and McLachlan (1992).
Observed in Børgesen’s permanent preparations of
Callithamnion scopulorum (no. 839, Vaago,
4.IV.1896). Otherwise only recorded by Holt (un-
publ. report, 1975, as G. elegans (Chauv.) LeJol.);
cited by Irvine (1982).
* Sahlingia subintegra (Rosenv.) Kommann
(Fig. 2F)
Reference: Kommann (1989).
Stations: 1008, 1015, 1688.
Littoral to 20 m depth.
Remarks: collected in July and October. Epiphytic on
Lomentaria articulata (Huds.) Lyngb., Polysipho-
nia fibrillosa (Dillwyn) Spreng. and epizoic on hy-
droides.
Morphology: thallus microscopic, monostromatic, fila-
mentous, disc-shaped with some bifurcate marginal
cells.
Discussion
Six species of non-Porphyra/Bangia ban-
giophytes have been recorded from the
Faroe Islands, although the records for Por-
phyrostromium boryanum and Stylonema
alsidii could not be confirmed (Irvine,
1982). This may be an underestimate of the
diversity of these species as most can only
be detected and identified with the aid of a
microscope. Culture work coupled with
molecular studies are necessary to get a
better understanding of the taxonomy of
these species (Brodie, pers. obs.).
At least 11 species of Porphyra have
been recognised, including four which may
represent undescribed taxa. In the context
of the northeast Atlantic (see Brodie et al.,
1998) Porphyra is a well-represented
genus in the Faroe Islands. In comparison
with the British Isles, whose Porphyra flo-
ra has recently been studied (Brodie and
Irvine, 2002), most species are common to
both areas (Table 1). P. dioica, P. leucostic-
ta, P. linearis, P. purpurea and P. umbili-
calis are widespread throughout both areas.
P. miniata and P. amplissima are northem
elements of the flora, with the former not
recorded from the British Isles and the lat-
ter only extending south to the Isle of Man.
P. drachii J. Feldmann was not reported
from the Faroe Islands in this study. It was
not recognised in the British Isles until
1994 (Brodie et al., 1998) and the full ex-
tent of its đistribution is unknown. The
same is also true for P. yezoensis sensu Ko-
rnmann (1986) and there has only been one
record from the British Isles (Brodie and
Irvine, 2002). The four possibly unde-
scribed species from the Faroe Islands may
also be more widespread but have hitherto
gone unrecognised. Porphyra sp. 1 has an
identical rbcL-rbcS intergenic spacer to