Plate XLIX. 
Fig. 220. DUDRESNAIA COCCINEA. 
Colour. Eosy-red ; pinkish when young. 
Substance. Very tender and gelatinous ; loose and slippery-feeling. 
Character of Frond. Cylindrical stem and branches ; rather distantly, and very irregularly 
divided (alternate, opposite, forked, or secund) ; each set gradually finer upwards. 
Branchlets much divided ; young specimens, when seen through a lens, looking as 
if beaded with rose-coloured dots owing to the structure {densely -tufted^ dichotomous 
filaments^ whorling a colourless axis I) 
Measurement. From 4 to 8 inches long. 
Fructification. Of two kinds. 1. Dark red globules of spores attached to the filaments which 
form the outer layer of the frond. 2. Tetraspores in transparent cells similarly 
placed. Very rare. 
Habitat. Southern shores of England and Ireland. On rocks near low-water mark ; or from 
deep water. Very rare. 
Fig. 221. DUDRESNAIA DIVARICATA. 
Colour. Pale red. 
Substance. Gelatinous ; very soft ; elastic. 
Character of Frond. A cylindrical, thread-like {filamentous^ much-branched stem ; un- 
divided ; set with long opposite or alternate, horizontally-spread branches. Branches 
three or four times re-branched ; all the branches alternate ; horizontally spread. 
Branchlets numerous ; horizontal ; obtuse. 
Measurement, From 3 to 6 inches long. 
Fructification. Only one kind known. Globules of spores attached to the filaments which 
form the outer layer of the frond. 
Habitat. The warmer stations on our coasts. On stones and the smaller algae near low-water 
mark ; and deeper. Very rare. 
Now Helminthora divaricata. 
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