more or less rounded gi'anules with scarcely any appearance
of jelly.” — Berk.
The Anacystis furfuracea would appear to he an entirely
different plant.
14. H æmatococcus lividus Hass.
Plate L X X X I I . FG. 5.
Char. Crust o f an indefinite extent, and livid colour. Granules
spherical, green, small, solitary or binate, and frequent,
quaternate, the quaternate granules being contained in
spherical cysts.
Palmella livida Carm., in Grev. Flor. Fdin. P. livida
Harv., in Manual, p. 178. Microcystis livida Meneghini,
hlonographia Nostochinearum Italicarum, p. 74, 5.
Hab. “ On overhanging cliffs, covering them to an indefinite
extent with a dirty black scu rf: ” Captain Carmichael.
Found on limestone rocks near Poilballintrea,
CO. A n trim : D. Moore.
The solitary and binate granules which constitute by far
the greatest portion of the plant are not enclosed in cysts,
and therefore do not ajipear to be surrounded by a transparent
limb or border. The granules however when associated
in pairs or multiples of that number are always enclosed
in a distinct cyst or vesicle, and occasionally It happens in
this as in other species of this division of the genus Hæmatococcus,
that each of the contained granules is also furnished
with a distinct envelope.
Mr. Moore writes of this species; — “ This singular substance
covers the overhanging limestone rocks to a great extent,
sometimes as much as several hundred yards together. When
fresh, it looks like a blackish brown, gelatinous substance,
giving the rocks on which it grows the appearance of being
covered with pitch. On places where it becomes dry by
exposure to the sun, it is very friable, and on being touched
crumbles down to a powder. Under the glass it is found to
be composed of excessively minute granules, pellucid in the
centre with darker edges. Is it a Palmella ? ”
15. H æmatococcus æeuginosus Hass.
Plate L X X X I I . Fig. 3.
Char. Stratum æruginous green, firm. Granules minute,
mostly solitary, and not enclosed in cysts, somewhat angular,
occasionally in their ultimate developement associated in
pairs or multiples o f that number and contained in a
globose vesicle.
Palmella æruginosa Carm., MS.
Hab. Appin : Captain Carmichael.
Of this species, remarkable for the richness of its colour, I
found a specimen in the herbarium of Sir W. J . Hooker. In
its microscopic character. It resembles somewhat H. lividus,
but is altogether a smaller plant.
16. H æmatococcus theeiacus Hass.
Plate L X X V I I I . Fig. 9.
Char. Granules excessively minute, mostly solitary and spherical,
but occasionally enclosed in cysts.
Hah. Eievaulx Abbey, Yorkshire : Dr. Allman.
This is the most minute species of the genus. Dr. Allman,
who alone has noticed it, compares its appearance to
that of inspissated syrup.
17. H æmatococcus vulgaeis Hass.
Plate L X X X I . Fig. 5.
Char. Cells mang-cysted, o f various sizes and forms. Granules
angular, numerous in each cell, often repeatedly
divided into fours.
Pleurococcus vulgaris Menegh., Consp. p. 20. Chlorococcum
vulgare Grev., Scot. Crypt. Fl. vol. iv. No. 262.