Flos, CcelifoLium,(from caelum, heavenly, flos, or folium, a leaf; so called because it was supposed to be a fallen star). In some places it is known by the name of star fall. Purgamentum stel-larum; commonly nostoch. Tremella nostoch Lin. Sp. Pi. 1625.

It is a species of jelly, sometimes clear, at others greenish, and agitated with a kind of tremulous motion so long as it is fresh.

It is found after rain in meadows, and in dry parched grounds, generally betwixt the spring and summer seasons. If not gathered before the rising of the sun, it will be shrivelled up to a thin membrane of a brownish colour.

The nostoc is in reality a moss, adhering to the earth by one or more slender roots. The embryo at first appears like a small tubercle; which is fleshy, soft, and diversified with inconsiderable inequalities, like those on strawberries, of a greenish blue colour, but afterwards clear. This membrane is gradually unfolded on the earth, and remains while the weather is moist. It affords a clear insipid liquor, that turns hydrargyrus muriatus white, and syrupus violarum green. It affords a volatile salt well crystallized, ammonia, and a fetid oil. The Germans use it to make the hair grow.