Pl. cell. aph. 2. THALASSIOPHYT/E. 72. Himant. 389 
XLVII. 72. HIMANTHALIA. Lyngbye.  Sea-strap. 
Thallus egglike, becoming shieldlike, stipitated ; holdfasts 
shieldlike; apothecia forked, compressed, arising from the 
centre of the thallus ; sporidia intermixed with jointed fibres 
in thecze immersed in the apothecia. 
_ Aimanthalia elongata. Long sea-strap. 
Fucus longo angusto crassoque folio, Rait Syn. 43, 11. 
Fucus fungis affinis, Rati Syn. 43, 15. 
Fucus loreus, Fl. Dan. 710; Turn, Hist. 196; Engl. Bot. 569. 
Fucus elongatus, Lin, S. P. 1627. 
Ulva pruniformis, Fl. Norveg. 2, 89. 
Sea-shore. 
Thallus 2 or 3 inches high; apothecia solitary or aggre- 
gate, 1 to 10 feet long; angles of the forks and tips acute. 
B. inequalis. Receptacles irregular in breadth ; angles of 
the fork and tips blunt. 
XLVIII. 73. CERVINA. Horn-weed. 
Thallus roundish, forked, with a small black longitudinal 
line in the centre; vesicles 0; holdfasts shieldlike; sporidia 
intermixed with jointed fibres in thecze immersed in ter- 
minal apothecia. 
Cervina tuberculata. Tulercled horn-weed. 
Thallus leatherlike, cartilaginous, threadlike, irregularly 
two-forked; angles of the forks rounded; apothecia oblong, 
cylindrical, blunt. 
Fucus kali geniculato similis, non tamen geniculatus, Raii Syn. 43, 13. 
Fucus tuberculatus, Huds. Fl. Angi. 588. 
Fucus bifurcatus, Withering Bot. Arr. 4, 109. 
Sea-shore; perennial; June to October. 
XLIX. 74. FUCUS. Theophrastus. Wrack. 
Thallus flat, confluent, forked, mid-ribbed ; vesicles 0 
or innate; ho/dfasts shieldlike; sporidia intermixed with 
jointed fibres, in roundish theca, immersed in terminal 
apothecia. 
1. Fucus serratus. Serrated wrack. 
Thallus flat, mid-ribbed, linear, forked; edge serrated, 
toothed; apothecia flat, linear, slightly pointed. 
Fucus sive alga latifolia major dentata, Raii Syn. 42,7. 
Fucus serratus, Lin. S. P. 1626. 
Sea-shore; perennial; winter and spring. 
