APPENDIX. 
Character of Frond. Slender; thread-shaped {filiform)'^ profusely branched; solitary or 
tufted. Stems wide in proportion to the hranchlets ; once or twice forked ; set 
with long, wavy, horizontally-spread, opposite or alternate branches, tapering gradu- 
ally upwards, and several times rebranched. Branches clothed with very slender- 
jointed hranchlets ; these furnished at every joint with rings {whorls) of minute, 
bead-like branchleteens, once or twice forked, and forming a little frill round each 
joint. Structure, an internal-jointed tube, covered by a streaked, fibrous membrane, 
which, when fully developed, conceals it. The younger branches, or hranchlets, 
therefore, where this coating is imperfectly grown, appear jointed, the older stems 
not. A branchlet, with its bead-like branchleteens fringing the partition lines 
{dissepiments) of every joint, is an exquisite microscopic object. 
Measurement. Two or four inches long, and as much in the spread of the branches. 
Fructification. Only one kind known. Tufts of naked spores formed in the middle part of the 
hranchlets ; swells them out ; attached to the ivhorled branchleteens. 
Habitat. S. Catherine’s Bay, Jersey : Miss Turner and Mr. Girdlestone. Exmouth : Mrs. 
Gulson. 
To outward observation this plant is much more slender and feathery than NaccariaWiggii 
(fig. 218) ; but any doubt as to which is which is solved at once by the microscope. In 
N. Wiggii the branchleteens are so slender and so gelatinous that they clothe the hranchlets 
like a pile, and their position is difficult to discover. In N. hypnoides, although some of 
them cling to the stems whence they spring, the extremities of most are quite free, and their 
whorled position easily observed. Their more bead-hke character and larger size are an- 
other mark of distinction. •*' 
Family XIV. SQUAMAEIE^. 
CBUOEIA PELLITA. 
Colour. Dingy red. 
Substance. Tough, but rather fleshy-feeling. 
Character of Frond. A scab-like incrustation spreading on the surface of rocks; composed of 
minute densely-packed, upright-jointed threads {filaments), set in gelatine. Filaments 
robust at the base ; tapering upwards ; in tufted bundles below ; such of them as 
elongate, spreading upwards in a repeatedly forked manner. 
Measurement. The patches indefinite. 
Fructification. Only one kind known. Oblong tetraspores (divided across into four) ; boine 
on the threads of which the frond is composed; supplying the place of a branch in- 
one of the lower forkings. 
Habitat. Sound of Jura: Professor Walker Arnott. Cumbrae: Mr. Kennedy. Miltown Malbay : 
Dr. Harvey. Probably in many other places. On rocks between tide-marks. 
The Gruoria pellita of fig. 227 has been transferred to another genus, and is now 
Fetrocelis cruenta. This change is owing to the position and character of the fruit, in 
Petrocelis (which, like Gruoria, is an incrustation composed of jointed threads) the tetraspores 
are formed in the (then) swollen centre cell of the threads themselves. In true Gruoria they 
are home, as above described, on the threads of which the frond is composed: in fact, by 
the transformation of a branch into fruit. Scientific accounts of the Gruorias, accompanied 
by plates, were published in the Natural History Bevieiv, 1857, “Proceedings of Societies, 
p. 201. 
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