Palmella granosa Berk., Glean. Brit. Alg. ii. p. 19. Bli-
crocgstis granosa Meneghini, 1. c. p. 85.
llah. Growing in great abundance on sub-immersed
Ilgpnum stellatum., in the bogs bordering on Whittlesea
hlere, summer : Rev. 31. J. Berkeleg. Aberdeen :
Dr. Dickie. Broadwater Forest : 3Ir. Jenner.
“ Pale green, or when preserved in the herbarium, with a
pale brownish tint. Growing in large masses of no certain or
distinct form, but broken into many angular faces, having a
very granulated appearance, and crumbling beneath the fingers.
The whole plant is made up of sub-elliptic, hyaline,
colourless, jelly-like bags, containing from two to four green
elliptical granules, which in some lights appear as if surrounded
with a pellucid border.” — Berk.
Meneghini makes the following remarks on this fine species
: “ Hie auctor monet speciem hanc præter colorem Hæ-
matococco sanguineo Ag. simillimam esse; et ejusdem affini-
tate cum Palmella rupestris animadvertens limites generum
Hæmatococcus et Palmella incertos esse demonstrat, summo
nempe acumino novi generis Microcystis instituendi necessi-
tatem præsenserat.”
b. Usuallg but one investing membrane or vesicle.
* Granules from one to eight.
8. Hæmatococcus alpestkis Hass.
P late L X X X I . Fig. 3.
Char. Globules o f verg variable size, often large, rarelg
concentric, containing one, two, four, or eight, but usuallg
tioo or fo u r small, spherical, dark green granules.
Pleurococcus glomeratus ? Menegh., loc. cit. t. v. f. 2.
Hab. Wales: S ir W. J. Hooker.
On looking over the splendid collection of Algæ forming
part of the herbarium of Sir W. J . Hooker, I noticed a
specimen of a dark olive compact substance two inches in extent,
marked Tremella. This, on examining with the microscope,
I soon ascertained to belong to the present genus, of
which it forms a remarkable species — one remarkable for the
size of the vesicles, the smallness of the enclosed granules, and
for the absence in general of concentric rings or vesicles.
** Granules mostly numerous in each cell.
9. H æmatococcus sanguineus Ag.
Plate L X X IX . Fig. 2.
Char. Smaller cells spherical, containing usually one or two
granules; larger, often angular, and filled with numerous
blood-red, circular, and nucleated granules.
Hæmatococcus sanguineus Ag., Icon. Alg. Furop. Xo. xxiv.
Palmella ? sanguinea Ag., Syst. p. 15. Hæm. sanguineus,
in part, Harv. Manual, p. 181.
Hab. On shady rocks at Tohermorey in Mull : W. H.
Harvey.
Mr. Harvey in his “ Manual ” has included in his Hæmatococcus
sanguineus two species, the one being the Palmella?
cryptophila of Carmichael, the other, in all probability, the
true H. sanguineus, a production which would seem to be as
rare as it is strikingly beautiful, it only having as yet been
discovered in one locality by Mr. Harvey, to whom I am indebted
for the specimen from which my figure Is taken. The
smaller cells are quite spherical, and contain but a single
blood-red granule, a wide peUucid border produced by the
thickness of the single vesicle which encloses it surrounding
the granule: the larger attain a very considerable size, are
mostly angular, and include a very considerable number of.
large spherical granules, each of which is occasionally surrounded
by a transparent vesicle, in which state each separate
granule is to be regarded as a distinct young frond enclosed
in the parent cell.