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“LEMANEACES, 295 
“ From a, cartilaginous disc, strongly applied to foreign bodies, proceed 
a great number of close filaments, elastic, of a-brownish-green colour, 
and a little curved at the base, but they become more pale and straight 
in the remainder of their length. These filaments are ordinarily from 4 
to 7 inches in length. Some are entirely simple, the others throw out 
here and there branches, or divide towards the middle of their length. 
The internodes are oblong, from a line to a line and a half, cylindrical, 
and inflated at their points of contact. Their divisions are often but little 
apparent, and disappear towards the base of the filaments, which appear 
continuous, cylindrical, and equal in diameter to a strong horse-hair, 
The surface of the filaments in old age is encrusted in such a manner as 
not to become recognizable either by its colour, which changes, or by the 
destruction of the internodes, which become confused and disappear.”— 
Bory. 
Plate CXXVIIT. fig. 1. Filaments natural size; a, portion of fila- 
ment magnified; 5. section of same; ¢, chains of spores x 200. 
Lemanea torulosa. (Roth.) Ag. Spec. u. 4 
Nearly simple, for the most part bent like a bow, 1-2 inches 
long, nodules approximate, papillae flattened, sometimes con- 
fluent or almost obsolete. 
Sizz. Spores :04- x *022-:03 mm. 
Rabh, Alg. Hur. iii, 411. Kirch. Alg. Schles. 48. Eng. 
Fl. v., 322. Gray Arr. i, 288. Hass. Alg. 71, t. 7. 
Conferva torulosa, Dillw. Conf. p. 77, t. F. 
Conferva fluviatilis nodosa fucum emulans, Dill. Muse. t. 7, 
f. 48. 
Lemanea fluviatilis, var. 3. torulosa, Eng. Bot. ii., t. 2423, 
Harv. Mon. 119. 
Conferva fluviatilis, var. 2, With. Arr. iv., 134, 
In streams. 
«From a little horny disc, fixed to the hard bodies which support it, 
arise from six to thirty filaments, from one inch to 24 inches in length, 
curved in one direction. Their colour is of a brownish or reddish-green, 
obscure or livid. They acquire in diameter the greatest dimensions of 
all the Confervee.”—Bory. 
Bory states that “ M. Thore, of Dax, first remarked, in the Conferva 
fluviatilis of Linneus, a fact which is verified in the other species of our 
genus. The recent filaments of this Lemanea, presented towards the 
flame of a candle, explode and extinguish the candle. This phenomenon 
does not take place in dried specimens. It is owing to some gas shut 
up in the connections of the joints, and which, put in expansion by the 
heat, presses against the walls and breaks them with an explosion. A 
remarkable movement of retraction is experienced in the fingers which 
hold by the two extremities the filament experimented upon. As to the 
smell of the burnt plant, although very peculiar, it cannot be compared 
to:that of animal substances submitted to the fire. I have not met with 
any Lemania in stagnant waters; they grow in quick waters. It is in © 
the pure fountains, large rivers, in very rapid rivulets, that they appear 
to delight. Many, moreover, flourish especially in those places where 
the current has the greatest farce, such as in mill sluices, and the most 
impetuous falls of cascades.”—Hassall’s Alga, p. 70. 
Plate CXXVIII, fiy. 2. Filaments natural size. 
