PLcelLaph. 2.THALASSIOPHYT.ZE. 48. Merret. 340 
3. Merrettia alpicola. Alp-loving merret t. 
Thallus not uniform, lobes numerous, rounded, wrinkled, 
soft, reddish; sporidia very small, reddish. 
Ulva montana, Light f. Scot. 973 ; Engl. Hot. 2193. 
Palmella alpicola, Lyngbye Hydr. Dan. 296. 
Mountain dulse. 
Sides of mountains, among grass and moss. 
Thallus deep blood-red or dull green ; lobes several, 
fiattish, rounded, ascending, imbricate, rather leatherlike,, 
pulpy. — Used to purge calves. 
4. Merrettia protulerans. Protuberant merrett . 
Thallus thick, gelatinous, fleshy, angular, pellucid, green ; 
sporidia large, elliptical, growing protuberant, green. 
Ulva protuberans, Engl. Bot. 2533. 
Shady wet places, among mosses ; September. 
Thallus composed of thick, fleshy, juicy, wrinkled, rough 
lobes; sporidia the size of poppy seeds. 
XXIV. 49. OLIVIA. OlivL 
Thallus ovate or globular, solid, aggregated into a gela- 
tinous or powdery crust; sporidia globular, immersed, scat- 
tered. 
1. Olivia botryoides . Bunch- of- grapes olivL 
Thalli minute, globular, pellucid, green, aggregated into 
a greenish crust. 
Byssus botryoides saturate virens, Dilltn in Rail Syn. 56, 5. 
Byssus botryoides, Lin. S. P. 1639. 
Lichen botryoides, Acharius Prod. 10. 
Tremeilo botryoides, Schreber Spicil. 141. 
Nostoc botryoides, Agardh Syn. 135. 
Palmella botryoides, Lyngbye Hydr. Dan. 205. 
Lepraria botryoides, Engl. Bot. 2148. 
On the ground, or bark of trees, in damp places. 
Thalli the size of maw-seed, solid ; stain the fingers when 
touched. 
2. Olivia ochracea. Okery olivL 
Thalli minute, ovate, oker yellow, aggregated into thin, 
scattered, powdery patches. 
Lepraria ochracea. Turn, and Bor. Lick. Brit. 1, 8$ Engl. Bot. 2408. 
Trunk of old trees and on moss. 
