Still specimens frequently occur which seem to connect the
two.
This species was discovered by the late Professor Mertens, on
the coast of Holland, about the close of the last century, and first
published by Roth, in his ‘ Catalecta.’ Mr. Dillwyn soon afterwards
detected it near Swansea. It does not appear to be uncommon
on the rocky parts of our shores,, growing generally in clear
water, and most frequently in deep pools near low-water mark.
Seen under water it has much of the glaucous colour of C.
Hutchinsia; sometimes it occurs of a darker green, and then approaches
some of the less branched forms of C. rupestris, but is
a larger and stronger growing plant.
Fig. 1. CLADornoKA d i f f u s a :— o f the
3. Apex of a brancUet :—both ma<
natural size. 2. Part of a filament.
