394 ALGiE GLOIOCLADEiE. [Protococcus. 



tuous, laxly set in the interior of the lobe, but closely agglutinated to- 

 gether on the exterior; and yet, even there, they are perfectly distinct 

 from each other, being separated by the firm gelatine, as may at once 

 be perceived by viewing a portion of a lobe vertically, when they appear 

 like points, bristling over the hyaline substance of the frond. Striae closely 

 set and conspicuous. 



10. R. plana, Harv. (green crustaceous Pivularid); frond 

 crustaceous plane widely spreading dull-green lubricous darker 

 towards the centre — Chcetophora plana, Ag. Syst. Alg.p. 28 ? 

 — Scytochloria plana, Harv. MSS. 



On marine rocks, Miltown Malbay, W. H. Harvey. — Fronds crusta- 

 ceous, spreading in suborbicular or irregular patches of indefinite extent, 

 from one inch to two feet or more in diameter, of a dull green colour, 

 towards the edges, but darker in the centre, with more or less of a 

 nigrescent or deep olive cast; smooth, lubricous, gelatinous, fragile, 

 easily torn, sub-transparent. Filaments erect, straight, tufted, pale- 

 green, simple or very sparingly pseudo-branched ; striae tolerably evi- 

 dent, close. 



SECT.3.(Raphidia, Carm.): frond gelatinous, subglobose, bullated. 

 Filaments few (compared with the quantity of gelatine) subulate, 

 moniliform within, scattered through the gelatine or radiating 

 from a central point. 



\ 11. R. angulosa, Roth, (plum-like Rividaria); fronds gre- 

 garious roundish gelatinous hollow, filaments distant simple 

 subulate moniliform within. — Ag,. Syst. Alg. p. 25. — Linhia 

 nutans, Lyngb. Hydroph. Dan. t. 67. — Raphidia natans, Carm, 

 MSS.— Ulvapruniformis, E.Bot. t. 968. 



Attached to water-plants, in ponds and still waters. — " Fronds grega- 

 rious, often confluent, one-fourth to three-fourths of an inch in diameter, 

 roundish, gelatinous, vesicular and when detached rising to the surface 

 of the water with the velocity of an air-bubble. Filaments at the dis- 

 tance of 4 — 5 diameters from each other, radiating in all directions, from 

 the centre of the vesicle ; rising from a colourless globule, inflated for 

 about one-third of their length, thence tapering to a long, slender, often 

 curved point. Internal mass moniliform, occupying about one-half the 

 diameter of the inflated part of the filament. Colour pale chestnut, in- 

 clining to olive." Carm. 



Tribe XXI. NostochjnejE. 



Plants more or less globose, gelatinous or car nose, including 

 granules scattered through them or arranged in moniliform series. 



92. Protococcfs. Ag. Protococcus. 



Globules aggregated, naked, containing granules, sessile upon 

 a transparent gelatinous mass. Grev. — Name; ir^orog, first or 

 primary and noxxoc, fruit; alluding to the simplicity of its 

 organization. — Agardh states that the globules of his Protococ- 

 cus are perfectly simple or consisting merely of a hyaline peri- 



