MELANOSPERME»®. 61 
sionally be mistaken for a delicate form of Enteromorpha compressa 
(Fig. 8). Striaria attenuata is found in the Mediterranean, and is said - 
to be abundant all round the British coasts. I have, however, found it 
only on the sonth Vevonshire coast, from May to July. 
Fic. 63. . Dictyosiphon feniculaceus. 
The third division of the Dictyotacee contains the concluding members of 
the order, some of which have flat, undivided, membranous fronds, others 
are tubular, and all areunbranched. Thegenus Punctaria, from punctum, 
Fic. 64. Striaria attenuata. 
a dot. in reference to the peculiar dot-like fruit of these plants, contains 
three species. The first of these is Punctaria latifolia (Fig. 65), a pretty 
summer annual, which grows in tufts on rocks and on other seaweeds in 
pools between tide marks. The illustration is from a tuft of this species, 
