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SVENSK BOTANISK TIDSKRIFT. 1920. Bp. 14, H. 2—3. ui
REMARKS ON SPLACHNIDIUM RUGO-
SUM (L.) GREV.
BY
CARL SKOTTSBERG.
Splachnidium appears to have become a favorite theme of lady
botanists. In 1892 a study of this alga was made by MARGARET
MITCHELL and FRANCES WHITTING, who came to the conclusion
that it ought to form a separate order, characterized mainly by
zoosporangia contained in conceptacles (Phycological Memoirs ed.
by GEORGE Murray Pt. I, no. 1). Lately, MABEL Rok (A contri-
bution to our knowledge of Splachnidium, Bot. Gazette 62, 1916)
has tried to trace the history of the »initial cell» and finds it pre-
ferable to retain the plant among the Fucaceae, regarding it as
almost intermediate between this order and the Laminariaceae.
OrrMANNs (Morphologie und Biologie der Meeresalgen I. 376)
regards the inilial cell as »rätselhaft» and mentions the plant in
conneclion with the Encoeliaceae.
Geographical distribution.
According to DE Toni, Sylloge Algarum I. 224, S. rugosum, the
only species, has been observed in Eastern India, along the coasts
of Australia, Tasmania and New Zealand, at St. Paul’s Island and
at the Cape of Good Hope. From all these regions except India
I have seen material in herbaria.
In August, 1908, I discovered Splachnidium growing in Bahia del
Padre, Masatierra (Juan Fernandez Islands), off the coast of Chile.
This isolated locality fills the gap in its circumpolar distribution.
It has not been found in Polynesia, and I did not see it in Easter
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