OiiD. VII. Tribe II. ALGiE NOSTOCIIIN/E. 920 
15041 Minute roundish soft rose-colored containing extremely minute sporules 
15042 Frond deformed rugose, Granules ovate red 
15043 Frond crust-like crimson 
15044 Corpuscles radiant lanceolate jointed 
15045 Branches elongated 
15046 Branches short obtuse 
15047 Frond filiform simple 
15048 Frond expanded deformed plaited wavy 
15049 Frond globose watery inside, Integument coriaceous very smooth 
15050 Frond globose solid smooth 
15051 Frond bladdery subcoriaceous hollow plaited smooth 
15052 The only species 
15053 Frond hemispherical hard, Filaments very dense branched by apposition 
15054 Frond globose hollow, Filaments simple 
15055 Filaments intermingled with calcareous particles hard and crustaceous when dry 
15056 Frond tubercular hollow. Filaments distributed in many little orbs 
15(57 Frond linear flattish dichotomous at base much pinnated at end 
(B Branches very short 
15058 The only species 
and Miscellaneous Particulars. 
Kermesina is found under stems, stones, or in crevices of limestone, where light can scarcely gain admittance, 
its color gradually passes from red to green. 
*' The only difficulty in the way of this explanation of its nature is in the statements of so many observers, 
that the red snow falls from the air. But Professor Agardh shrewdly remarks, that all the persons agree that 
it fell in the night, which is as much as to say, that no one saw it fall. He is of opinion that the Protococcus, 
or Red Snow, is called into existence by the vivifying power of the sun's light, after its warmth has caused 
the snow to dissolve, and accompanied by that incomprehensible power in white snow, of producing a color ; 
and, moreover, that" it first attracts the eye when there is a considerable quantity, in the same way that we do 
not see the color of drops of water till they have accumulated in the ocean." 
2266. Echinella. From echinus, an hedgehog, in allusion to the bristly appearance presented by its radiant 
particles. Many naturalists believe the bodies referred to this genus to be animalcula. 
2267. Alcyonidium. So called, from a,\x,uovitov, the foam of the sea, among which the plants referred to this 
genus are naturally produced. This also is supposed to be the nidus of animalcula. Lamouroux who origin- 
ally fixed it here, afterwards referred it to Zoophytes ; in which last opinion Gaillon agrees with him, declaring 
that he has actually seen the animalcula nestling in it. D'Orbigny and Ellis consider it the ova of a testaceous 
animal. 
2268. Nostoc. A name first used by Paracelsus, without an explanation of its meaning. Agardh thinks 
this singular substance changes into the genus Collema among the Lichens. 
2269. Corynephora. From xo^wv, a club, and (fi^a, to bear, in allusion to the clavate filaments which are 
found on different parts of it. The species are found in the ocean." 
2270. Rivularia. So named on account of the places in which the species grow. They have a globose frond, 
of a gelatinous but toughish texture. Their color is dark-green, and not as in the next genus, pale-green. 
The filaments are very singular, seated on a globule, simple, cylindrical, and terminated by a very fine point ; 
they are densely compact, continuous, and filled with a green annular matter. 
2271. Chcetophora. From ^at/rij, a bristle, and (pi^eu, to bear ; the filaments are terminated by a bristle-like 
point. This genus is chiefly distinguished from Confervoideas by its gelatine. The color is bright green, and 
the texture softer than in the preceding. The manner of propagation, which has been noticed in so small a 
number of Algae, has been observed by Agardh in two species of this genus. In Chaatophora pisiformis little 
hard crystalline corpuscles, like grains of sand, may be seen, which separate from the mother plant and pro- 
duce young filaments. But in C. clavata, the points of the filaments fall off and sink to the bottom of the 
water, where they unite by three, four, five, or by a greater number at a time, in a common point, which is first 
green, afterwards blackish, and apparently inorganic. From this beginning new individuals arise. 
2272. Scythymenia. Derivation unknown. A very singular plant, formerly referred to Ulva. It has the 
habit of a fungus, and grows upon damp walls. It is supposed to be most nearly related to Palmella. 
3 O , 
