Fróðskaparrit - 01.01.1996, Síða 78

82
SPECIES ON THE ALGAL GENUS VAUCHERIA ON THE FAROES
Vaucheria dillwynii forming a green mat on the rock, the gorge at Gjógv, May 1996. Photo R. Nielsen.
the material from 1994 twenty oospores
from sample 1 gave an average length of
164 jim (inclusive of the oogonium wall
opposite to the opening). Sample 2 gave
162 jtm but sample 16 only 135 jtm. Thus
there is a marked clonal difference between
samples 1 and 2 on one side and sample 16
on the other. In other characters, such as the
shape and dissolution of the antheridium
and the pattern of the oogonium wall, there
is little difference between the three clones,
and not too much by comparison with
material from continental Europe. So the
samples are just listed together under the
earliest specific name.
V. frigida (Roth 1797) C. Ag. 1824 has
been found in the samples 2, 5 and 12.
A representative of the V. geminata com-
plex (figs 1-5) is particularly frequent in the
material. It has no name of its own, nor
have its rather similar two-spored allies as
found in other regions including Denmark
proper, the whole group being perhaps too
vaguely distinct within the many-formed
geminata complex. It is stouter than typical
V. geminata, with longer fruiting branches,
and sometimes it has three oogonia on one
fruiting branch, exceptionally even four.
Where there are more than two the fruiting