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Pl.celLaph. 2.THALASS10PHYTiE. 63. Gastrid. 319
Sea-shores; annual; summer.
Thallus 6 to 12 inches long, twice or thrice pinnate.
6. hi/lridum. Thallus almost cylindrical, rather cartilaginous;
twigs slightly attenuated at the bottom, and rounded
at the tip.
b. Gastridium. Thallus even^ or wieqiially contracted into
apparent joints ; tubercles on the sides.
S. Gastridium ovale. Oval bellif-iveed.
Thallus nearly cylindrical, threadlike, irregularly twoforked,
below naked, covered above on all sides with simple
elliptical twigs.
Fucns ovalis, Huds. Fl. ylngl. 573 ; Engl. Bot.in ; Turn. Hist. 81.
Fiicus sedoicies, Stackh. Ner. Brit. fi7.
Fucus vermiciilaris, Lightf. Scot. 958.
Giffartina ovalis, Lamour, Thai.
Chondria ovalis, yJgardh Disp, 18.
Submarine rocks; annual; summer.
Thallus 3 or 4; inches high; pale reddish brown.
(3. lotryoides. Twigs short, nearly globular.
Fucus botryoides, Wulf. in Jacq. Collect. 3, 146.
7. suharticulatum. Twigs long, linear, contracted as if
jointed.
4. Gastridium tenuissimum. Very thin helly-weed.
Thallus gelatinous, threadlike, cylindrical, pinnately
branched ; branches alternate, spreading, mostly simple
twigs cylindrical, simple, scattered.
Fucus tenuissimus, Goodcn. in Tr. Lin. Soc. 3,215; Engl. BotA682
Turn. Hist. 100.
Ulva capillaris, Htids. 571.
Giganina tenuissima, jigardh 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-treed.
Thallus threadlike, branched ; branches and tivigs tworowed,
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, tubular,
apex acute ; branches smaller at each end, spreading
segments lanceolate.