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The cells of this species precisely resemble those of II.
Allmani in form and size, the only difference being that of
colour, and the absence of the mucous elongations. I t ought,
assuredly, to he regarded as congeneric with H. Allmani.
In a specimen from the herbarium of Sir W . J . Hooker, the
grannies were not, as in other specimens which I have examined,
exactly cylindrical, but somewhat pointed at one
extremity.
May 14.1845. — I have just detected mucous appendages
in this species similar to those of H. Allmani.
3. H æmatococcus cryptophila Hass.
Plate L X X X . Fig. 1.
Char. Granules hlood-red, small, usually oval.
Palmella? cryptophila Carm., MS. cum Icone. Hæmatococcus
sanguineus, in part, Harv. in Manual, p. 181.
Hab. On a stalactltic incrustation lining the vault of a
cavern in a quartz rock, Appin : Captain Carmichael.
This forms wide patches, externally of a brick-red colour,
but within whitish, breaking up easily into the numerous
separate portions of which each mass is formed. The reason
of the red colour being confined to the external surface of
the crust results from the structure and mode of developement
of the species of this genus. The colour resides alone
in the granules: these terminate the superior extremity of
the mucous prolongations, which are colourless, and arranged
almost entirely side by side. The granules or cells are several
times smaller than in H. Allmani.
b. Mucous prolongations transversely corrugated or ringed.
Granules 1—2 in each cell, spherical. Vesicles numerous.
. 4. H æ m a t c c c c c u s in s ig n is Hass.
Plate L X X X . Figs. 6 a. 6 b.
Char. Granules very large, spherical, blood-red.
Hah. England.
This very fine species I have never met with in any considerable
quantity. Scattered isolated globules I have frequently
met with, and these occasionally attached to a closely
corrugated or ringed mucous appendage. Each globule is
usually surrounded by a single vesicle or ring: in some
globules, however, there are as many as four or five enclosing
vesicles.
5. H æmatcccccus H cckeriana Berk, and Hass.
Plate L X X X . Fi^. 4.
Char. Granules very small, spherical, hlood red, surrounded
hy one or more investing membranes or vesicles.
Hab. On a chalk cliff at Mundley, Norfolk: Sir W. J.
Hooker. Dropping Well, Knaresborough: Dr. Allman.
Shortly after noticing this species in heautlful condition,
mixed up with H. Allmani, but which had altogether escaped
the notice of Dr. Allman, I received a dried specimen of
this plant, accompanied by a description and remarks on the
ringed organization of the mucous appendages from the Rev.
M. J . Berkeley, to whom it had been communicated for examination
by Sir W. J . Hooker. Specimens of H. Allmani avid,
II. Hookeriana were then sent to Mr. Berkeley, who satisfied
himself of the identity of Dr. Allman’s specimen with tha t
transmitted to him by Sir William Hooker. The only difference
between the specimens collected in habitats so widely
different was, that in the former the transverse corrugation
of the sheath was the more conspicuous.
The Rev. M. J . Berkeley, in his first letter, thus speaks of
i t :—“ I have ju st received the enclosed from Sir W. J . Hooker.
I t does not agree with any of Meneghini’s species of Microcystis.
There is a very curious appearance in some parts as
if the old vesicles were chained together.” In a second communication,
Mr. Berkeley adds—“ I have not had time to examine
your Alga till to -d ay : it is certainly the same as Sir W.
Hooker’s, but far fin e r; the threads are three or four times
as long. I still fancy my theory, as to their origin, is right.”
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