habit than by any precise character ; that species growing in globose
masses, which are unattached, and lie, subject to the drifting
of the waves, on the sea-bottom.
Mastophora licheniformis, Dene., which Kutzing refers to the
plant now figured, is very different in many ways, generically
and specifically.
Fig. 1. Melobesia l ic h en o id e s ; growing on a piece of rock:— the natural
size. 2. Portion of a frond:—magnijied. 3. Vertical section tbrough an
I ceramidium :—maqnified. 4. Portion of the cellular substance :—
