mucoso frondls matricalis substrato obvoluta et impedita
extrlcari nequeunt et ibidem evolvuntur usque dum tandem
eodcm dissoluto et cvanido libere disseminantur. In primis
illis frons, tota vita perdurante, semper definita rcmanct : in
bis primum definita quldcm est, sed ab Inltio usque eifimditur
et dissolvitur. Dlffcrunt itaque Coccochlorides a Palmellis, in
co quòd granula in sinu globirlorum ipsorum gignuntur et
evolvuntur, proptereaque frons definita liic necesse inest, dum
illæ eodem necesse carent; et quamquam serins in multis
quoque Coccoddorihus frons ipsa effundatur, origine tamen
summopere ab illa Palmellarum differt. I ta u t Palmellæ Proto-
coccos in muco indefinito nidulantes représentant, sic Cocco-
cldorides a Chlorococcis in fronde mucosà definita inclusis
efformatæ dici possimi.”
1. CoccocnLOKis P E O T U B E R A N S Spreng.
Piate L X X V I . Pig. 7., and PI. L X X X I I . Figs. 6, 7,
8, 9, 10.
Char. Fronds green, gelatinous, soft, irregularly lobed, spreading,
confluent. Globules elliptical, generally more obscure
towards the centre. Vesicles o / various sizes, spherical or
elliptical, constantly surrounded with a diaphanous margin.
Ulva protuberans Smith, E. B. t. 2583. Palmella protuber
ans Grev., Flor. Edin. p. 323. ; Crypt. Fl. t. 243. f. 1.
Palmella protuberans Ag., Syst. p. 14. ; Hook. Br. Fl.
vol. ii. p. 396. ; Harv. in Manual, p. 176. Coccochloris
protuberans Spreng., Syst. Veg. vol. Iv. p. 373. Palmo-
gloea protuberans Kützing, Phy. Gen. p. 176.
Piab. Sussex, spring to autumn : Mr. Borrer. Camsie
Glen, near Glasgow : Sir W. J. Hooker and Dr. Greville.
Pentland Hills : Dr. Greville. On the ground at Crowborough
W a rren : Mr. Jenner. Co. Wicklow: Mr.
Moore.
“ The fronds in the beginning roundish, of very variable
magnitude, quickly run into a mass more or less extensive,
investing surrounding bodies or spreading over the naked soil.
Its substance, in the beginning watery and pellucid, becomes
at a later period firmer and more intensely green. The frond
itself, subjected to the microscope, differs very considerably
in the different states of its developement. When it is green
and firm, the globules scarcely vary at all in dimensions, but
generally stand at the one hundred and twenty-fifth part of
a millimetre In the greatest diameter, and their form always
oblong, varies from elliptical to irregularly angular. Their
interior substance appears obscurely granular, and is always
more opaque in the centre. The vesicles are variable in form
and magnitude ; the smaller are mostly spherical, the larger
elliptical, all constantly surrounded by a hyaline border.
The smallest of all only difier from the other globules in
their spherical form and diaphanous margin ; and the most
nevertheless attain the fiftieth part of a millimetre in diameter,
and the largest have the twentieth part in their
greatest diameter. The larger these are, the more manifestly
granular is the structure of the interior substance: when
enclosed they scarcely equal the thousandth part of a millimetre.
The diaphanous margin is equally manifest both in
the smaller and greater vesicles, and preserves the same proportion.
In the more delicate fronds, and those having less
consistence, being almost w atery, the mass itself is constituted
of a colourless thin mucus, in which the oblong cylindrico-
elliptical, or rarely spherical globules, reaching from the two
hundredth to the one hundredth part of a millimetre in their
greatest diameter, hyaline or diluted green, scattered here and
there, appear, with areolæ intensely green, presenting a definite
suhorbicular, or but irregular form, constituted of firmer and
more intensely coloured mucus, and filled with subrotund
globules, varying in diameter, from the thousandth to the
two hundredth part of a millimetre, and surrounded with a
narrow diaphanous margin. Intermediate forms are sometimes
noticed, in which the mass itself, more diluted and-
watery, gradually disappears, and the green areolæ increased
in size, and at length confiuent, assume finally the characters
of the older fronds.” — Menegh.