378 62.Gigart. 2. THALASSIOPHYT. Pl. cell. aph. 
Sea-shore, or submarine stones or rocks. 
Thallus 1 to 3 inches high, more or less compressed, 
flattened. 
XXXVIII. 68. GASTRIDIUM. Lynebye. Belly-weed. 
Thallus threadlike, round, tubular, gelatinqus, cartila- 
ginous; ¢ulercles roundish, lateral or terminal; sporidia 
in the tubercles and also on the twigs. 
a. Laurentia. Thallus compressed ; tubercles terminating 
the twigs. 
1. Gastridium pinnatifidum. Feather-cut belly-weed, 
Thallus compressed, cartilaginous, branched; branches 
mostly alternate, doubly pinnatifid; twigs blunt, callous. 
Fucus Dealensis pedicularis rubri folio, Dillen in Raii Syn. 48, 37. 
Fucus ramosus piperis sapore, Dillen in Raitt Syn. 51, 55. 
Fucus pinnatifidus, Huds, Fl. dngl. 581; Engl. Bot. 1202; Turn. Hist. 
20. 
Fucus multifidus, Hudson, 581. 
Fucus corymbifer, Wulff. Crypt. 32. 
Fucus corymbiferus, Esper, 94, 
Laurentia pinnatifida, Lamour. Thall. — 
Chondria pinnatifida, 4gardh Syn. 35. 
Gelidium pinnatifidium, Lyngbye Hydr. Dan, 40. 
Pepper dulse. Faminkiren, Ireland. 
Sea-shore; annual; autumn. 
ei ageregate, yellowish red, diaphanous; ¢as/e hot, 
acrid. 
B. filicinum. Thallus roundish; twigs cylindrical, thick- 
ened upwards, clustered, mostly simple. 
Fucus Osmunda, Nereis Brit. 46. 
Fucus filicinus, Lightf. Scot. 954, not of Hudson. 
y. angustum. Thallus compressed ; twigs clublike, crowd- 
ed, mostly simple. 
8. tenuissimum. Thallus compressed ; twigs divaricated, 
branches very slender. 
2. Gastridium obtusum. Blunt belly-weed. 
Thallus cartilaginous, cylindrical, threadlike, repeatedly 
pinnated; branches generally opposite; twigs cylindrical, 
short, spreading, blunt. 
Fucus obtusus, Huds. Fl. Angl. 586; Engl. Bot.1201; Turn. Hist. 21. 
Fucus spinosus, Wulf.in Jacq. Coll. 3, 156. 
Laurentia obtusa, Lamour. Thal. 
Chondria obtusa, dgardh Diss. 18. 
