Pil. cell. aph. 2. THALASSIOPHY Ti. 63. Gastrid. $81 
10. Gastridium repens. Creeping belly-weed. 
Thallus nearly cylindrical, threadlike, solid, contracted 
as if jointed, branched, with a network of internal fibres; 
branches horizontal, pointed; joints lanceolate, obsolete. 
Tremella marina cxspitosa, segmentis tenuibus, Dillen Hist. Muse. 50. 
‘Fucus repens, Lightf. Scot. 961. 
Ulva articulata 6, Huds. Fl. Angl, 569. 
Fucus Opuntia, Gooden. Tr. Lin. Soc. 3,219 3 Turn. Hist. 107. 
Rivularia Opuntia, Engl. Bot. 1868. 
Sea-shores; annual; summer. 
B. cespitosum. Thallus entangled, half an inch high; 
tip clublike. x 
Fucus cespitosus, Stackh. Ner. Brit. 39. { 
Gigartina pilosa, Lamour. Thal. 
ce. Lomentaria. Thallus regularly contracted, appearing 
as if jointed ; branches verticillate ; tubercles lateral. 
11. Gastridium articulatum. Jointed lelly-weed. 
Thailus cylindrical, threadlike, tubular, contracted 
throughout as if jointed; branches level-topped, 2-forked 
or whirled; joints nearly cylindrical, pitchershape. 
Corallina lenta purpurea compressa, Raii Syn. 34,9. 
Ulva articulata, Huds. Fl._Angl. 560. 
Fucus articulatus, Lightf. Scot. 959. 
Fucus sericeus, var. Esper, 82. 
Gigartina articulata, Lamour. Thal. 49. 
‘Czramium torulosum, Roth Cat. 6, 125. 
Sea-shores; annual; June and J uly. 
8. repians. Thallus slender, creeping, shining. 
_ Couferva.reptans, Roth Cat. 1, 186, 
d. Plocamium. Thallus compressed, membranaceous, 
mostly pinnate ; tubercles lateral. 
12. Gastridium glandulosuim. Glandular belly-weed. 
Thallus membranaceous, linear, compressed (tubular 
Engl. Bot.) branched; branches alternate, decumbent; 
iwigs 2-cut, bent inwards. 
Fucus glandulosus, Zurn. Hist. 38; Engl. Bot. 2135. 
Delesseria glandulosa, Agardh Disp. 14. nt 
Thallus 1 or 2 inches long, creeping, vatiously and re- 
peatedly branched; sporidia immersed in the oblong, swol- 
len twigs. : 
