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184
THE MARINE ALGÆ OF NEW ENGLAND.
present genus resemble the species of Calothrix rather than Lyngbya, but the filaments are not
prolonged in a hair-like extremity as in the first-named genus.
S. fasciculata, Kütz.
Filaments a quarter to half an inch high, united in tooth-like masses from a
gelatinous base. .009-12 mm broad, sheaths thin, cells broader than long.
On rocks between tide-marks.
Newport, R. I.; Europe.
Table of comparative distribution of New England species.
Number of New
England Genera.
Number of New
England Species.
Number of species
north of Cape Cod.
Number of species
south of Cape Cod.
Common to North
-ern Europe.
Common to Mediterranean
and
Adriatic.
Common to Pacific
coast of United
States.
Cryptophyceæ 17 - 32 - 24 - 24 - 26 - 20 - - - - - - - 1 - 2 -
Chroococcaceæ - 5 - 6 - 5 - 4 - 5 - 3 - - - - - - - 1 - -
Nostochineæ - 12 - 26 - 19 - 20 - 21 - 17 - - - - - - - - -
Zoosporeæ 36 - 88 - 71 - 65 - 77 - 34 - 15 - 33 - 3 - 2 - 3 -
Chlorosporeæ - 7 - 36 - 28 - 27 - 30 - 15 - 7 - 6 - - - 1 - 1
Bryopsideæ - 2 - 2 - 1 - 2 - 2 - 2 - 1 - - - - - - - -
Botrydieæ - 1 - 1 - 1 - - - 1 - - - - - - - - - - - -
Phæosporeæ - 26 - 49 - 41 - 36 - 44 - 17 - 7 - 27 - 1 - 1 - 2
Oosporeæ 4 - 11 - 7 - 7 - 11 - 2 - 2 - 7 - - - - - - -
Vaucherieæ - 1 - 2 - 1 - 2 - 2 - 1 - - - - - - - - - -
Fucaceæ - 3 - 9 - 6 - 5 - 9 - 1 - 2 - 7 - - - - - -
Florideæ 50 - 99 - 69 - 87 - 71 - 48 - 14 - 34 - 7 - 1 - 12 -
Total 107 - 230 - 171 - 183 - 185 - 104 - 31 - 74 - 10 - 4 - 17 -
Besides the genera and species, enumerated above, there are 4 genera and 10 species described, but not
considered to be sufficiently well known. If these are counted, the total number of genera is 111, and
240 species. The comparison with Mediterranean and Adriatic species is imperfect, because there is no
complete list of the algæ of those seas, and our Pacific coast has not as yet been sufficiently well
explored to make it possible to give approximately the number of our species found there. In the table
the species marked peculiar to New England are those which extend along our whole coast, those of
more limited range being kept distinct. The table shows plainly the general fact that the total number
of species increases as one goes southward, and that the increase is mainly due to the relative increase
in number of the Florideæ. It also shows the close resemblance of our marine flora to that of Northern
Europe, and although the number of species common to Arctic waters is not large, as far as the
numbers themselves are concerned, yet, if we consider the absolutely small total of species found in
Arctic regions, the number of species common to our coast is relatively very large. The general poverty
of our flora may be seen in comparing the number of genera and species found in New England with the
number of species and genera in Harvey’s Phycologia Britannica and Le Jolis’s Liste des Algues
Marines de Cherbourg. The number given by Harvey is 110 genera and 388 species; that given by Le
Jolis is 137 genera and 316 species. The Phycologia was published in 1846-’51, and Le Jolis’s Liste in
1863. In both works, more especially in the Phycologia, a number of species which we have in the
present article united were kept distinct; but as additional species have been discovered since the
appearance of the two works above named, the total number of species is not probably much less, or
may even be greater, than the figures given by Harvey and Le Jolis. In Phyceæ Scandinavicæ Marinæ,
published .in 1850, Areschoug describes 68 genera and 175 species. Since that date numerous additions
have been made to the Scandinavian marine flora, and the total number of species is probably not far
from that of the species of our own coast.
Arctic.
Peculiar to New
England.
Peculiar to coast
north of Cape Cod.
Peculiar to coast
south of Cape Cod.