ACOTYLEDONS. ALG/E. CkcCtopkora. 7o 



Hah. Rocks in the Highland rivulets, near the loot of the mountains, 

 frequent, Light f. 



Frond oval, an inch or more in diameter, olive green, gelatinoso-co- 

 riaceous, plicato-lobate, smooth, at length spreading into an ulva-. 

 like membrane, 4 — f) inches in diameter. Filaments flex\iose, com- 

 pact and intvicate, nearly equal at first, at length moniliform. Ag. 



2. ALCYONIDIUM. Lamour. 



Capsules graniferous, imbedded in a fleshy or gelatinous sub- 

 stance. Fro7/c?subcyliudiicaI, lobed; substance between sjjongv 

 and gelatinous. 



1. A. c?m/;/ia/z?^??/, subgelatinous pale yellowish pellucid somewhat 

 cylindrical with numerous branches and lobes of various sizes. 

 Ag. p. 131. Ulva diapharia, E. B. t,26'3. Alci/onhim ge- 

 latinosiim, Linn. 



Hae. Cast on shore in the Orkney islands, Mr. P. Nelll. 



Has very much the appearance of animal substance, 



3. RIVULAKIA. 



Filaments arising from a common base, continuous, annulated 

 within, of an olive or dark green colour, globular. — Filuinents 

 (resembling those of Oscillatoria) simple, continuous, annu- 

 lated within, having a globule at one extremity, at the other 

 terminating in a long diaphanous point. Their mode of in- 

 crease is hitherto unknown, 



1. R. ? tuheriformis, frond irregularly globose inflated folded oli- 

 vaceous brown smooth, globules of the filaments in the external 

 surface of the frond. E. B. t. 19.)6. Treniella dijfurmis^ 

 Lighlf. p. 900. 



Had. On Confervce and other marine substances, and on the rocks at 

 low water. Light/. Abundant at Ulva, Staffa, and lona, in such 

 situations. 



An inch or more in diameter, coriaceo-gelatinous, hollow. The fila- 

 ments tapering from the globular extremity, which is in the surface^ 

 internally, to long attenuated points. 



2. R. atray fronds hemisphierical solitary hard shining blackish 

 green, filaments densely crowded fasciculated at the base pel- 

 lucid green. yJg. p. 130. E. B. t. 1/9^. Tremella heini^ 

 splicerica, Linn., Lightf. p. 900. 



Hab. Marine rocks, not uncommon. 

 Minute, appearing black, 



4, CH^TOPHORA, 



Filaments arising from a common base, jointed. Gemmes scat- 

 tered among the mass of the frond.— FroJid very gelatinous, 

 palmate, globose, or filiform. Filamejils (like thoseol a Con- 

 ferva) branched, jointed, graduall\ tapering, pjoductd beyonri 

 the surface of t\\c fror/d, into long, diaphanou'5 points. Gem- 



