838 37.Hutchin. 2. THALASSIOPHYT&. Pl. cell. aph. 
15. Hutchinsia parasitica. Parasitic hutchins. 
_ Threads doubly pinnate, rather stiff, brownish red; seg- 
ments and lobes alternate; joints not quite so long as broad. 
Conferva parasitica, Huds, Fl Angl. 604; Engl. Bot. 1429; Dillw. 87. 
Hutchinsia Mostingii, Lyngbye Hydr. Dan. 116? 
Sea-shore; on marine plants. ; 
Thallus 1 or 2 inches long, slender; iwigs pointed, 
gradually smaller; thece oblong, axillary, pedicelled. 
16. Hutchinsia Brodiai. Brodie’s hutchins. 
Threads very much branched, purplish black ; branches 
long; twigs scattered, spreading, many-cut, in bundles; 
joints of the branches obsolete, of the twigs rather longer 
than broad. 
Conferva Brodizi, Dillw. Conf. 107; Engl. Bot. 2589. 
Thallus 1 or 2 feet long, repeatedly and finely branched ; 
thec@ \ateral or axillary. 
17. Hutchinsia pulchella. Pretty hutchins. 
Thallus much branched, round; branches and twigs 
ascending, alternate, close, pointed, simple or 2-cut; joints 
shorter than broad. ’ 
Fucus cristatus y, Turner Hist. Fuc. 48. 
Fucus cristatus, Engl. Bot. 1925. 
Sea-shores. 
Thallus 2 or 3 inches high, compressed, repeatedly alier- 
nately branched. 
XII 38. VERTEBRATA. . Backlone. 
Thallus round, forked, branched, smooth; axis central, 
jointed; joimts composed of many tubes, with a central 
opake spot; thece ovate, lateral, or in the tip of the twigs. 
Vertebrata fastigiata. Even-topped backbone. 
Threads forked, even-topped ; jozmts half as long as 
‘broad, with a central black spot. 
Conferva marina geniculata ramosissima lubrica, brevibus et palmatim 
congestis ramulis, Dillen in Rati Syn. 61, 24. 
Conferva marina, nigra palmata, Dillen Musc. 32. 
. Conferva polymorpha, Lin. 8S. P. 1636+ Engl. Bot. 17164; Dillw, 44, 
Fucus lanosus, Lin, Syst. Veg. ed. 13, 815. 
Ceramium fastigiatum, Roth Cat. 2,175. 
Hutchinsia fastigiata, Agardh Syn. 53. 
Sea and mouths of rivers; parasitic on fuci. 
