PI. cell. aph. 2. THALASSI0PHYT7E. 63. Gastrid. 381 
10. Gastridium repens. Creeping belly-weed . 
Thallus nearly cylindrical, threadlike, solid, contracted 
as if jointed, branched, with a network of internal fibres; 
handles horizontal, pointed ; joints lanceolate, obsolete. 
Treinella marina coespitosa, segmentis tenuibus, Dillen Hist, Muse. 50. 
Fucus repens, Lightf. Scot. 961. 
Ulva articulata /3, Hulls. FI. Angl. 569. 
Fucus Opuntia, Goodan, Tr. Lin. Soc. 3,219 ; Turn. Hist. 107. 
Rivularia Opuntia, Engl. Bot. 1868. 
Sea-shores; annual; summer. 
ccespitosum. Thallus entangled, half an inch high ; 
tip clublike. 
Fucus caespitosus, Stackh. Ner. Brit. 39. 
Gigartina piiosa, Lamour. Thai. 
c. Lomentaria. Thallus regularly contracted , appearing 
as if jointed ; branches verticiUate ; tubercles lateral. 
11. Gastridium articulatum. Jointed belly-weed. 
Thallus cylindrical, thi'eadlike, tubular, contracted 
throughout as if jointed ; branches level-topped, 2-forked 
or whirled; joints nearly cylindrical, pilchershape. 
Corallina lenta purpurea compressa, Raii Syn. 34,9. 
Ulva articulata, Huds. FI. Angl. 560. 
Fucus articuiatus, Lightf. Scot. 959. 
Fucus sericeus, var. Esper , 82. 
Gigartina articulata, Lamour. Thai. 49. 
Caeramium torulosum, Roth Cat. 6, 125. 
Sea-shores; annual; June and July. 
£. replans. Thallus slender, creeping, shining. 
Conferva reptans, Roth Cat. 1, 186. 
d. Plocamium. Thallus compressed, membranaceous, 
mostly pinnate ; tubercles lateral. 
12. Gastridium glandulosum. Glandular belly-weed, 
Thallus- membranaceous, linear, compressed (tubular 
Engl. Bot.) branched; branches alternate, decumbent; 
twigs 2-cut, bent inwards. 
Fucus gland ulosus. Turn. IJist. 38; Engl. Bot. 2135. 
Dele.sseria glandulosa, Agardh Disp. 14. 
Thallus 1 or 2 inches long, creeping, variously and re- 
peatedly branched; sporidia immersed in the oblong, swol- 
len twigs. 
