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348 47. Palmel. ^.THALASSIOPHYT^. Pl.cellaph.
XXII. 47. PALMELLA. Lyngbye. Trembler,
Thallus cylindrical, simple or branched, solid ; integument
membranaceous ; inside gelatinous, cellular ; sporidia
globular, immersed in the thallus.—Marine.
1 Palmella defracta. Broken tremhler,
Thallus threadlike, simple, twisted, elastic, viscid, pel-
lucid; sporidia globular, pale red.
Ulva defracta, WUli. Bot. An: 4, 124; Engl. Bot, 1626.
On sea-plants.
Thallus 2 to 12 inches long, l-8th mch in diameter.
2. Palmella elminthoides. " Wormlike tremhler.
Thallus threadlike, mostly simple, opake, slippery, rather
blunt; central line dark, parenchymatous; sporidia very
minute, opake.
Ulva elminthoides, With. Bot. An: 4, 141.
Rocks in the sea; July.
Thalli aggregated, 4 to 7 inches long, twisted.
XXIII. 48. MERRETTIA. Merrett.
Thallus flat, diversely shaped, solid; integuments membranaceous;
inside cellular, gelatinous; sporidia scattered,
immersed.
1. Merreltia adnata. Adnate merrett.
Thallus diversely shaped, gelatinous, wrinkled, brownish
yellow; sporidia globular, brown.
Tremel la adnata, /fttrfsoK F/.u^n^i. 555.
Palmella adnata, Lyngbye. Uydr. Dan. 205.
On rocks between high and low water in the sea.
Thallus wrinkled, 3 to 6 inches in diameter, less than a
quarter thick.
2. Merreltia coriacea. Leathery merrett,
Thallus flat, adnate, very wide, indeterminate, smooth,
slippery, dull red; sporidia globular,
Ulva rupestris, Engl. Bot. 2194.
Upright faces of fells over which water trickles.
Thallus 2 or 3 feet wide, resembles a spread-out piece of
very wet reddish or greenish brown washed leather, but is
not so tenacious; has been mistaken for flesh.