388 70. Desmar. 2. THALASSIOPHYT&. Pl. cell. aph. 
2. Desmarestia ligulata. Straplike desmarest. 
Thallus flat, nearly ribless, doubly pinnate ; branches 
2-rowed, opposite, membranaceous, linear, lanceolate ; edge 
serrate with spinous teeth. 
Fucus ligulatus, Lightf. Scot. 949; Turn. Hist. 98; Engl. Bot. 1636. 
Fucus herbaceus, Huds. Fl, Angl. 582. 
Desmarestia ligulata, Lamour. Thal. 25. 
Laminaria ligulata, 4gardh Disp. 13. 
Desmia ligulata, Lyngbye Aydr. Dan. 34, 
Sea-shores; perennial; summer. 
Thallus 2 to 3 feet high, delicate, yellow, becomes pale 
green, when exposed to the air. 
6. angustior. Thallus narrow, trebly pinnate; twigs 
scarcely cut on the edges. 
y. dilatata. Twigs nearly elliptical, narrowest at bottom. 
XLVI. 71. LICHINA. Agardh. Lichen-weed. 
Thallus cartilaginous, roundish or angular, branched, 
shrublike; sporidia ovate, intermixed with jointed fibres, in 
the ovate thecze immersed in the swollen apex of the twigs, 
leaving a hole at the top, then dilating and becoming con- 
cave.— Has the appearance of a lichen. 
1. Lichina pygmea. Pigmy lichen-weed. 
Thallus compressed; branches very short, divaricating, 
dilated; tubercles globose. 
Fucus pygmeeus, Lightf. Scot. 964; Turn. Hist, 258; Engl. Bot. 1322. 
Fucus pumillus, Huds. Fl, Ang. 584. 
Fucus lichenoides, Gooden. in Linn. Tr. 3, 192. 
Gigartina pygmea, Lamour. Thal, 49. 
Lichina pygmea, Agardh Syn. 9. 
Gelidium pygmeum, Lyngbye Hydr. Dan. 41. 
Rocks below low water; perennial. 
Thallus forming very thick tufts, upright, a quarter of 
an inch high. 
2. Lichina pumila. Dwarf lichen-weed. 
Thallus roundish; branches long, nearly cylindrical ; tu- 
Lercles elliptical, at the ends of the branches. 
Fucus pygmeus £, Turn. Hist. 4,17. 
Lichen confinis, char. Prod. 208; Engl. Bot. 2573. 
Stereocaulon confinis, Achar. Meth. 317. 
Lichina pygmea minor, Agardh Syn, 10, 
On rocks in the sea. 
Thallus tufted, upright. 
