Pil. cell. aph. 2. THALASSIOPHY T. 69. Sporoch. 387 
XLIV. 69. SPOROCHNUS. Agardh. Sporochnus. 
Thallus threadlike, cartilaginaus; branches pinnate ; spo- 
ridia scattered in the ovate or globular ends of the twigs - 
which end in jointed radiating filaments. 
1. Sporochnus pedunculatus. Footstalked sporochnus. 
Thallus. cartilaginous, threadlike; branches irregularly 
pinnated, mostly alternate, elliptical. 
Fucus pedunculatus, Huds. Fl, Angl. 587; Turn. Hist. 188; Engl. Bot. 
545. ; 
Fucus Gertneri, Gmelin, 164. 
Gigartina pedunculata, Lamour. Thal. 
Sporochnus pedunculatus, Agardh Disp. 12. 
Sea-shores. 
2. Sporochnus villosus. Villous sporochnus. 
Thallus cartilaginous, threadlike ; Lranches opposite, dis- 
tant, pinnate, spreading; twigs elliptical. 
Conferva villosa, Huds. Fl. Angl. 603; Engl. Bot. 546; Dillw. 37? 
Chordaria? villosa, 4gardh Syn, 14. 
Sea-shores; annual. 
XLV. 70. DESMARESTIA. Lamouroux. Desmarest. 
Thallus compressed, pinnately branched ; twigs slenderest 
at bottom; edges serrate; holdfasts shieldlike; sporidia 
along with jointed threads from the serrated edges of the 
twigs. , 
1. Desmarestia aculeata. Prickly desmarest. 
Thallus woody at the bottom, cylindrical, very much 
branched; branches flat, cartilaginous, linear, ribless, re- 
peatedly branched; twigs pinnate; edges spinose; spines 
upright. 
Fucus angustifolius, foliis dentatis, Rati Syn. 48, 38. 
Fucus aculeatus, Lin. S. P. 1632; Turn. Hist. 187; Engl. Bot, 2445. 
Fucus muscoides, Gmelin, 130. 
Fucus virgatus, Fl. Norv. 45. 
Fucus contortus, Esper, 43. 
Fucus usneoides, Oeder Enum, 113. 
Desmarestia aculeata, Lamour. Thal. 25. 
Sporochnus aculeatus, 4gardh Syn, 10. 
Desmia ligulata, Lyngbye Hydr. Dan. 34. 
Sea-shores; perennial; winter. 
Thallus obsoletely contracted, olive-green becoming 
black. : 
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