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structure with the other species so iicanied, our genus Litosiphon,
which has been formed to include the present plant and the
Asperococcus pusillus, Carm. (PL CCLXX.), must probably be
given up. By Kützing these plants are, however, widely separated,
A. pusillus being associated with the Chlorosiphon Shuttle-
worthianus of that author, a production which I regard as merely
the very young state of Chorda lomentaria. I cannot consent
to separate these parasites, which appear to me to have a close
relationship and similar structure.
By its first discoverer our L. Laminarice was placed in Bangia,
which was then a common receptacle for any filiform plant
marked with transverse, closely-set bands of cells. Here for a
long time it was suffered to remain unmolested, though almost
every author who subsequently described it agreed in pronouncing
that it had no natural affinity with the type of the
genus Bangia, and was even referable to a different Series or
great division of the Algæ. Still no one, till recently, took any
active step in the matter. Many years ago, Mr. David Moore
remarked the affinity of Bangia ? Laminarice with Asperococcus
pusillus, and suggested the propriety of forming a genus for
their reception, a suggestion which I recorded with approbation
in the first edition of the Manual (p. 173), but did not then
adopt. Mr. Moore is therefore properly the originator of the
present generic group, to which I have now merely given a
name.
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Fig. 1 . Portion of tlie frond of Alaria esculenta, with tufts of L i t o s i p h o n
L a m i n a b I jE growing on i t :— the natural size. 2. Tuft of fronds. 3. Apex
of a frond. 4. Base of the same. 5. Part of the middle portion of the
same :— all more or less highly mi