U l
i l *
m
Second Suhgenus. — Mucous appendage wanting. Granules
one, two, or four, in each cell.
Ohs. I t is possible tha t subsequent research may prove
that one or more of the species of this section should be referred
to the first suhgenus.
a. Investing vesicles numerous.
6. H æmatococcus rupestris Hass.
Plate L X X X I I . Fig. 1.
Char. Granules spherical, olive green, single, sometimes binate,
verg small, each enclosed in several distinct enveloping
vesicles.
Palmella rupestris Lyngb., Hydroph. p. 207. t. 69. D.
P. rupestris Ag., Syst. p. 13. Microcgstis rupestris Kiitz.,
Linnæa, p. 374. No. 9. Microhaloa rupestris Kützing,
Phycologia Generalis, p. 169. ; Harv. in Hook. Br. Flora,
ii. 397. ; also In Manual, p. 178. ; Meneghini loc. cit.
Hah. On moist overhanging cliffs, Appin : Capt. Carmichael.
Aberdeen : Dr. Dichie. On moist conglomerate
sandstone caves near Cushendall, co. Antrim :
Air. 3Ioore.
“ Frond hyaline, gelatinous, yellowish green, easily broken
np, about an inch in diameter, shapeless, rough; pellucid,
more dense in the centre and elevated ; when dried, collapsed ;
blackish, cartilaginous, fragile. Subjected to the microscope,
it appears constituted of hyaline subspherical vesicles,
enclosing yellowish green, spherical or slightly oblong globules,
usually undivided. Solitary globules, magnified with
glasses less powerful, are seen free and naked ; by means of a
more powerful microscope, almost all are perceived to be
clothed with a proper cyst, larger vesicles enclose smaller,
and the whole frond appears areolated, the hollow areolæ containing
solitary or binate globules. The vesicles, general as
well as partial, duplex, triplex, or multiplex, and that without
any perceptible order,- commonly present concentric circles,
generally approximated, evident to the light. But the quaternary
type, both in the distribution of the vesicles and globules,
is generally preserved. The diameter of the globules
is constant at the two hundredth part of a millimetre ; that of
the vesicles varies from the hundredth to the twenty-fifth part
of a millimetre.
“ A t a more advanced period of growth, some globules become
thicker, and manifestly include a granular substance,
the partial vesicles at the same time becoming dissolved, and
disappearing. Towards the circumference of the frond are
often noticed globose, elliptical, or irregularly lobed areolæ,
which are seen to be gelatinous, and all filled with very minute
granules scarcely the fiftieth part of a millimetre in size.
I t appears, therefore, that each one of the larger vesicles, the
partial vesicles included by it being absorbed, the globules
having been converted into granules, is changed into a new
frond. As often as a fragment of the frond is compressed between
plates of glass, the oblong gelatinous bodies enclosing
very small granules, which we regard as new and incipient
fronds, and which are always present in great abundance, are
lacerated, their contents poured forth, and they then cover
the other parts with the thin mucus with which they are
themselves enveloped; and from this C. Kützing appears
to have asserted that the vesicles were enfolded, the green
stratum enclosing very minute granules. I t is yet remarkable
tha t the multiplied and concentric vesicles escaped the
celebrated Kiitzing and the acute Lyngbye.” — Meneghini.
7. H æmatococcus granosus Harv.
Plate L X X X I . Fig. 6.
Char. Crust widely spreading, granulated, pale green. Cells
polymorphous, formed o f two or three vesicles, and each
containing one, two, or fo u r green, large, elliptical granules
ivitli distinct hyaline borders.
T 4
L L .