Calothzix Ozsiniana. Thur. Ann. 8ci. Nat.
Forming a pulvinate stratum, as much as two lines in th ick ness,
dark brown, lubricous, opaque; trichomes elongated,
branched, of nearly equal thickness, cuspidate at the apex or
obtnse, distinctly articulate, here and there moniliform ; sheaths
thick, lamellose, golden brown, from the base to above the
middle even, apical portion more or less dividing in fibrous
lamella}.
S i z e . Trichomes with sheath • 0 1 - - 0 1 2 mm., without sheath
• 0 0 4 - - 0 0 6 mm.
Kirch. Alg. Schles., p. 219.
Scytonoma cirrhosum, Berk. Eng. Bot. ii., t. 2920.
Caenocoleus cirrhosus, Berk. Eng. Bot. ii., sub. t. 2940.
Schizosiphon cataractce, Nag. in Kutz. Tab. Phyc. ii., t. 52,
f. 1. Rab. Alg. Eur. ii., 285.
On rocks and submerged stones.
Althongh we have seen no authentic specimen of Berkeley’s Ocenooo-
leus, the specimens from Ben Lawers, which we have referred as above,
appear to us to belong to the same species, as far as can be judged in the
absence of all measurement.
Plate O X III. fig. 1. Portion of triohome X 400; b, small fragment
magnified with sheath from Eng. Bot. t. 2920 ; c, cells of trichome free
from the sheath.
Calothrix S ill-w yn i. {Hass. Alg.)
Flaccid, bluish green or brown, trichomes usually cohering in
pairs, sheaths inconspicuous, except towards the base, joints
about half as long as their diameter, heterocysts at the base of
tbe branches ovate or cordate.
S iz e . Trichomes 'OOS-’OOfi mm., with she aths ’OOS-'Ol mm.
Desmonema Dillwynii, Berk. Eng. Bot. ii., Supp., t. 2958.
Tolypothrix Dillwyni, Hass. Alg. 242, t. 6 8 , f. 4-5.
Microcoleus Dillwyni, Harv. Man. 169.
Conferva vaginata, Dillw. Conf., t. 99.
On mosses and moist rooks.
Plant minute, flaccid, much branched, seldom a quarter of an inch in
length, varying in colour from brown to bluish green. Filaments
usually cohering in pairs. Sheaths inconspicuous, except those of the
older filaments at the base of the plant, which become thickened and of
a reddish brown colour. Endochrome annulated, more evidently so in
the recently formed filaments than at the base of the plant, dotted from
the presence of minute granules; joints about twice as broad as long,
the terminal one somewhat dilated and hemispherical. The branches
towards the base of the plant are seated each npon a connecting cell
(heterocyst) of an ovate or cordate form. The plant possesses other
branches formed by a dislocation of the endochrome, each separated
portion becoming elongated, the lower portion towards the apex of the
plant, and the upper portion towards the base, and each parallel and
coherent with the other, and nob usually separating until another dislocation
has taken place in the endochrome of one of them, so that the
filaments cohere mostly in pairs throughout the plant, though sometimes
four or more filaments are coherent within one common sheath.
The apparent branch (which is really a portion of the original filament)
always extends beyond the filament from which it appears to be
given off.”
The dried specimens, which alone we have seen, are insufficient to
determine the true relationship of this plant, hence, as well as the next,
their position must be accepted as provisional.
Plate OXIII. fg . 2. a, natural size ; b, portion enlarged; c, d, e,
trichomes X 400 diam.; c and d, after Berkeley.
Species uncertain.
Calothrix (?) Sm ith ii. {Berk, in Eng. Bot.)
Filaments red, creeping, branched, contained, with their
ramifications, within a tough, more or less permanent sheatli,
which bursts irregularly, endochrome annulated, v e rj slender,
green, joints about as broad as long.
S iz e . Not stated.
Ccenocoleus Smithii, Berk. Eng. Bot. t. 2940.
On moors.
“ Forming a red rugose mat of interlacing threads on boggy soil,
where it is very conspicuous, but from which it is separated with difficulty
on account of the roots and fibres of heath and moss to which it
‘ Threads elongated, branched laterally and acutely, their outer coat
being cartilaginous, within which fresh branches are generated and creep
within it till it is ruptured, when their free apices repeat the same
phenomena. Occasionally some of the ramuli burst through the sheath
a t the base in pairs, as in genuine Scytonemata. Endochrome very
slender, green, the articulations about as broad as long.”—M. J. B.
Genus 114. R IV U LA R IA . Roth. (1824.)
Frond having a tendency to an hemisphærioal or bladdery
form. Filaments agglutinated by a more or less firm mucilage,
exhibiting a disposition to radiate from the base of the frond.
Frond usually with a well-defined outline. Heterocysts basal
(placed at the base of the principal filaments and branchlets).
Ramifications produced by th e transverse division of the
triohomes, the upper part of which detaches itself and becomes
a lateral branohlet, while the lower part, extending itself by the
side of the old tip, makes a new extremity similar to the first.
Trichomes never producing any spores.