132 
THE GEYSERS. 
exposed to a considerable degree of heat, arising 
both from the water itself and the steam, I found 
Conferva limosa Dillw. in abundance, forming 
large dark green patches, which easily separated 
and peeled off from the coarse white kind of bo¬ 
lus that they were attached to. In a similar 
situation, also, I met with a new species of Con¬ 
ferva , (or rather Oscilla tor la of Vaucher ,) of a 
brick-red color, covering several inches of ground 
together, and composed of extremely minute un¬ 
branched filaments, in which, with the highest 
powers of my microscope, I was not able to dis¬ 
cover any dissepiments. The margin of one of 
the hot springs, upon a white bolus, which was 
in a state of puddle■ from its mixture with the 
heated water, afforded me the finest specimens 
of Jungermannia angulosa* I ever saw, growing 
thickly matted in such great tufts, that I could 
with ease take off pieces of five or six inches in 
* Mr. Barrow, in his Voyage to Cochinchina, gives us a 
very interesting account of the hot springs in the island of 
Amsterdam, which lies in latitude 38 & 42' south, and lon¬ 
gitude 76 ° 51' east. f . e Some of them,” he says, “ are run- 
“ ning freely, others ooze out in a paste or mud. In some 
tf of the springs Fahrenheit’s thermometer ascended from 62° 
<f in the open air to 196°; in some to 204° 3 and in others 
“ to 212 °, or the boiling point. In several places we ob- 
“ served patches of soft verdure, composed of a fine delicate 
“ moss, blended with a species of Lycopodium and another 
“ of Marchantia. These green patches were found to be 
