Fig. 248. SEIIIOSPORA GRIFFITH SI AN A. 
Colour. Beautifully rosy. 
Suhstaiice. Delicately soft. 
Character of Frond. Thread-like (^filamentous) ; jointed ; solitary, or tufted ; excessively 
branched. Stem as thick as a hog’s bristle below ; becoming gradually finer 
upwards; undivided (generally); furnished with alternate, slender, undivided, 
longish, almost horizontally set branches. Branches becoming finer upwards ; 
clothed throughout with short, soft, hair-like, many -times -forked branchlets ; 
spreading to every side. Last divisions cobwebby. 
Joints. Obscure in the stem and branches, which are opaque and veiny ; visible (when 
examined through the microscope) in the branchlets. 
Measurement. From 2 to 6 inches long. 
Fructification. Only one kind known. Tetraspores in bead-like cells strung together ; formed 
in a few divisions of the last branchlets ; looking like ruby drops. 
Habitat. A few places on the south and west coasts. On rocks, &c. in very deep water. 
Very rare. 
Dr. Harvey now includes this plant among the Callithamnions. It is the CalUthamnion 
seirospermum of his “Nereis Boreali- Americana.” A much slenderer form with the so-called 
seirosporian fruit has been found at Douglas. Possibly, therefore, this mode of fructification 
is only what gardeners call a sport. 
Fig. 249. WRANGELIA MULTIFIDA. 
Colour. A fine, transparent rose-red ; soon fading. 
Substance. Soft ; elastic. 
Character of Frond. Thread-like {filamentous)] jointed; stem and branches. Stem the thick- 
ness of a hog’s bristle, and undivided throughout ; furnished on each side with long, 
simple, alternate, almost horizontally-set branches. These re-branched with another 
series which arc occasionally forked or re-branched. Each joint of stem, branches, 
and branchlets beset, either in opposite pairs or all round {whorled), by numerous, 
short, slender, forked, jointed hmuchY^teens {ramelli) ] which are sometimes long, 
simple, and hair-like ; sometimes short and many times divided. 
Measurement. From 4 to 6 inches long. 
Fructification. Of two kinds. 1. Clusters of spores m globose, stalked ; enfolded by 
special, slender branchleteews (ramelli). 2. Tetraspores minute, oval, external ; sessile 
on the branchleteews. 
Habitat. South of England. West of Ireland and Scotland. On the perpendicular sides of 
rocks in pools near low-water mark, under the shade of other sea-weeds. Bare. 
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