il
G læocystis botxyoides. Ktz. phy. Gen. p . 173.
Thallus gelatinous, soft, sticky, green ; cells minute, globose
and oblong, associated in small families ; tegument colourless,
indistinctly lamellose, contents green.
S i z e . Cells -002--004 mm. ; families -01--018 mm.
Glceocapsa botryoides, Kutz. Tab. 1, t. 20.
On wood, submerged or constantly wet.
Plate I I I . fig. 3. Cells magnified 400 diam.
** Flesh-coloured, becoming reddish.
G læ o cy stis P a io lin ia n a . {Meneg. Nost. 1.10, f . 2.)
Thallus crustaceous, cartilagineous (horny when dry), about a
line thick, flesh colour; cells small, sphærioal, 2-4-8 associated
in families; tegument very broad, distinctly concentrically
lamellose ; contents becoming yellowish, granulose.
SizB. Cells -OOSy-'OOS mm. ; families -24 mm. { Rabh.).
Eabh. Alg. iii. 30.
Microcystis Paroliniana, Meneg. Nost. p. 78.
Glæocapsa Paroliniana, Kutz. Tab. i. 86, f. 5.
On rocks constantly wet.
Collected some years ago in Kent by Rev. M. J. Berkeley, and usually
found near the sea.
Plate I I I . Jig. 5. Cells magnified 400 diam.
G læocystis adnata. CBuds.J Nag.
Thallus broadly expanded, gelatinous, firm, yellow-brown; '
cells globose, or oblong; contents brownish-green or brown,
granular; tegument colourless, pellucid, lamellose
S i z e . Cells -OOS-'OIS mm. (Rabh.).
Eabh. Alg. iii. 31.
Tremella adnata, Huds. FI. Ang. p. 565.
Palmella adnata, Lyngb. Hydro, p. 205, t. 69. Berk. Glean,
p. 40, t. 15, f. 2.
Microcystis adnata, Meneg. Nost. p. 85.
“ Forming a thin yellow-brown, suborbicular, depressed stratum on
chalk cliffs, about high-water mark. The individual plants, which are
from 1-6 lines diam., are but very little thicker in the centre than at the
margin. The surface is rugulose and shining, substance firm, between
gelatinous and coriaceous. In age the plant gradually becomes more
tawny, but at all times under the microscope presents a pale ochraoeous
jelly filled with darker granules. Under a moderate magnifier the
granules appear globose, but under a lens with l-25th in. focus pellucid,
globose, colourless vesicles a.re seen to contain the darker granules, and
these are found to be elliptic. Sometimes the vesicles contain a little
tawny colouring matter, as though the sporules were broken down ; and
frequently the sporules burst through the coat of the vesicle in which
they are contained, and lie free on the general mass.”—Berkeley.
Plate H I . Jig. 4. a, natural size ; b, cells magnified 400 diameters.
Genus 4. UROCOCCUS. Hass. (1845.)
Cells large, globose, or oblong, reddish or blood-red ; tegument
thick, gelatinous, oonoentrioally lamellose; stem thick,
gelatinous, often ringed or annulate.
All the species in this genus are rare, and with one exception confined
to Britain. We are, therefore, compelled to reproduce figures already
published, without measurements or information beyond the original
descriptions.
The peculiar structure of the pedicellate cells is thus described by
Braun:—“ The large globular brownish-red or blood-red cells throw off
colourless layers of cell membrane, which appear to be separated by
intermediate layers of softer jelly, whence arises a distinctly concentric
structure of the envelope. But the enveloping layers of XIrococcus do
not retain their original form and integrity ; not increasing themselves
in size, they are pushed off on the upper side by constantly succeeding
inner coats, being at first merqly attenuated at one side, but subsequently,
as it seemed to me, actually broken through. Since this emergence
from the old coats is always repeated on the same side, a membranous
gelatinous peduncle is produced formed of cups fitted one into
another, so as to give an annularly streaked, apparently shortly articulated
aspect. The red cell, which occupies the summit of this peduncle,
sometimes divides, and this of course produces a subsequent dichotomy
of the peduncle. If the periods of the formation of the separate
enveloping layers were known, the age of the little plant, whose
history is preserved in the gelatinous peduncle, might be determined by
the number of rings.”—Rejuvenescence, p. 179.
* Stem annulate.
Urococcus H o o k e rian u s. Hass. A lg .t.SO .f. 4.
Cells globose, or elliptic, variable in size, blood-red, granular,
stem more or less elongated, often divided, densely ringed.
S i z e . Cells -013-'0 6 mm. {Rabh.).
Eabh. Alg. iii. 31.
Hcematococcus Hookeriana, Berk. & Hass, in Hass. Alg. p.
325, t. 80, f. 4.
On chalk cliff, &c.
Plate IV . Jig. 1. «, cells considerably magnified, after Hassall; h,
cells further magnified, after Kabenhorst.
Urococcus in sig n is . Hass. A lg .t. 8 0 ,/. 6, a.
Cells large, globose, blood-red ; s t e m abbreviated, remotely
annulated.
Rabh. Alg. iii. p. 31.
Hcematococcus insignis, Hass. Alg. p. 324.
“ 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.”—Hassall,
Plate IV.fig* 2. a, h, cells considerably magnified, after Hassall.