RHODOSPERMEA. 123 
o 
are ceramidia, with a pore or opening at the top, through which, at maturity, 
the tetraspores escape into the water. The name Melobesia is from one of 
the sea-nymphs of Hesiod. One of the commonest of these encrusting 
Fig. 112. Terminal branches, highly magnified, of (a) Jania rubens; (b) Jania 
corniculata, 
marine productions is the well-known Hildenbrandtia rubra, which is 
frequently found in extensive patches ofa beautiful rosy tint on rocks near 
low-water mark, or lining the lower surfaces of tide pools under the 
Fie. 113. Melobesia pustulata, parasitic on Phyllophora rubens. 
shelter of the Fuci or Kelpweeds. This species is a thin membranous 
crust, and is attached so firmly to the surface of the rock, that it is 
impossible to separate a portion for preservation as a specimen. This 
