Pi. cell. aph. 2. THALASSIOPHYT. 68. Gastrid. 379 
Sea-shores; annual; summer. 
Thallus 6 to 12 inches long, twice or thrice pinnate. 
8. hybridum. Thallus almost cylindrical, rather cartila- 
ginous; twigs slightly attenuated at the bottom, and rounded 
at the tip. 
b. Gastridium. Thallus even, or unequally contracted into 
apparent joints ; tubercles on the sides. 
8. Gastridium ovale. Oval belly-weed. 
Thallus nearly cylindrical, threadlike, irregularly two- 
forked, below naked, covered above on all sides with simple 
elliptical twigs. 
Fucus ovalis, Huds. Fl. Angl. 573; Engl. Bot. 711; Turn. Hist. 81. 
Fucus sedoides, Stackh. Ner. Brit. 67. 
Fucus vermicularis, Lightf. Scot, 958. 
Gigartina ovalis, Lamour, Thal. 
Chondria ovalis, 4gardh Disp. 18. 
Submarine rocks; annual; summer. 
Thallus 3 or 4 inches high; pale reddish brown. 
8. botryoides. Twigs short, nearly globular. 
Fucus botryoides, Wulf. in Jacq. Collect. 3, 146. 
y. subarticulatum. Twigs long, linear, contracted as if 
jointed. 
4. Gasiridium teniissimum. Very thin belly-weed. 
Thallus gelatinous, threadlike, cylindrical, pinnately 
branched ; branches alternate, spreading, mostly simple; 
twigs cylindrical, simple, scattered. 
Fucus tenuissimus, Gooden. in Tr. Lin. Soc. 3,215; Engl. Bot. 1682; 
Turn. Hist. 100. 
Ulva capillaris, Huds. 571. 
Gigartina tenuissima, 4gardh Disp. 18. 
Sea-shore, or on other marine plants; annual; summer. 
Thallus pale flesh-colour, tender, 6 to 10 inches long. 
5. Gastridium purpurascens. Purplish belly-weed. 
Thallus threadlike, branched; branches and twigs two- 
rowed, nearly opposite; last ones pinnate; segments small, 
opposite. — ‘ 
Ulva purpurascens, Huds. Fl. Angl. 569. 
Gastridium purpurascens, Lyngbye Hydr. Dan. 69. 
Sea-shore; annual; summer. 
Thallus 6 to 9 inches high, attenuated at bottom, tubu- 
lar, apex acute; branches smaller at each end, spreading ; 
segments lanceolate. 
