Pl. cell.aph. 2. THALASSIOPHYT Zs. 48. Merret. 349 
3. Merretiia alpicola. Alp-loving merrett. 
Thallus not uniform, lobes numerous, rounded, wrinkled, 
soft, reddish; sporidia very small, reddish. ' 
Ulva montana, Lightf. Scot. 973; Engl. Bot. 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, 
flattish, rounded, ascending, imbricate, rather leatherlike, 
pulpy.—Used to purge calves. 
4. Merrettia protuberans. 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. Olivi. 
Thallus ovate or globular, solid, aggregated into a gela- 
tinous or powdery crust; sporzdia globular, immersed, scat- 
tered. 
1. Olivia boiryoides. Bunch-of-grapes olivi. 
Thalli minute, globular, pellucid, green, aggregated inte 
a greenish crust. | 
Byssus botryoides saturate virens, Dillenin Raii.Syn, 56, 5. 
Byssus botryoides, Lin. S. P. 1639. 
Lichen botryoides, Acharius Prod. 10. 
Tremella botryoides, Schreber Spicil, 140. 
Nostoc botrysides, dgardh Syn. 135, 
Palmella botryoides, Lyngbye Hydr. Dan. 205.. 
Lepraria betryoides, 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 olivi. 
Thallz minute, ovate, oker yellow, aggregated into thin, 
scattered, powdery patches. 
Lepraria ochracea, Turn. and Bor. Lich, Brit. 1,8; Engl, Bot. 2408. 
Trunk of old. trees and on. moss. 
