IS 



CONFERVACE^E. 



[TlIALLOGENS. 



pari <>f an inch. Their small end is the most transparent, and it is curious to see how 

 constantly thi> is pushed forwards in the rapid evolutions made in the water by these 

 living particles. This sort of quasi animal life does not last long — a few seconds, some 

 minutes, or at the must half-an-honr. They often die : Unger assures us that he has 

 Been them in the agonies of death, and struggling convulsively (!), with all the appear- 

 and of animal life. 



Porphyra laciniata and vulgaris are stewed, and brought to our tables as a 

 luxury, under the name of [Aver ; and even the Ulva latissima, or green Laver, is not 

 alighted in the absence of the Porphyrse. Ulva compressa, a common species on our 

 shores, is regarded, according to Gaudichaud, as an esculent by the Sandwich Islanders. 

 Common Nostoc, commonly called star-jelly, a trembling gelatinous plant, that springs 

 np suddenly alter rain, is by superstitious persons supposed to possess virtue as a 

 vulnerary, ami in pains of the joints ; oyster green or Ulva lactuca (the fipiiov daXaacnov 

 of Dioecorides) is sometimes employed in scrofula; the ancients used it in inflamma- 

 tions and L;outy affections; its taste is so bitter and salt that it is usually given with 

 lemon juice. 



The Confervab found in many thermal springs, mostly species of Sphserozyga, are 

 used empirically as external applications to goitre, enlarged glands, <£c. Henry has 

 examined, the Confervals in the springs of Vichy, Neris, and Vaux, and found small 

 quantities of an alkaline iodide in each. {Cliem. Guz. 1844, p. 447.) 



Suborder I. — Palmel 

 le,r. Cells somewhat 

 globose or elliptical 

 free, and more or less 

 distinct, or collected 

 by means of a slimy 

 layer into a frond. 



Tribe 1. Protococddse, 

 —The slimy substratum 

 obsoU '.'. 



Protoeoeen 



a n Ua, Somm. 

 ophysium. Link. 

 < bulina, Turn. 



I'urp. 



1 1 eitOCOCCUS. .i i 



-■liutt. 

 Cbliirncoccuin, (leer. 



bulina, Turn. 

 - rid, Tnrp. 



PI am -cus. Itenegh. 



1 lormospora, Brtb. 



'OCCUS, lii. I;. 



Tribe 2. Coccochloiidte. 

 — The slimy substratum 

 evident 



Palmeua, Lyngb. 

 Priestleya, Sloven. 



Chaos, itnry. 

 Phytoconis, Bory. 

 tm codes, PaL 

 Memttta, Gray. 

 Bartoderma, Bfar. 



1 ■ icbli'ris, S/ir. 



Microcystis, A'»/.-. 



BichaUa, Tnrp, 

 Anacystia, Mentgh. 

 Oneobyna, Ag. ' 



Hydrococcut, Eats, 

 Micraloa, Biass. 



Hydrothrombium, Ktz. 



Botrydlna, Brebiss. 



Suborderll.— Nosi 

 Cells somewhat globose 

 or elliptical, coal* in ing 

 into a simple or bran- 

 thread; united In- 

 i ralrowsbymeans 



Of r\ slimy substratum 

 Of various forms. 



. Vouch. 

 Linkia, Mien, 



I'mliihi, Tries. 



cut, Link. 



GENERA. 



Tlirombium, WaHr. 



Monormia, Berkel. 

 Sphaerozyga, Ag. 



Anabaina, Bory. 



Trichormus, Allm. 

 Anhaltia, Schwabe. 



Suborder III. — Oscilla- 

 toreee. Cells tabular, 

 naked or furnished with 



a slimy or gelatinous 

 layer, continuous, but 

 seeming to be jointed 

 in consequence of in- 

 terruptions of the co- 

 louring matter. 



Tribe 1. Rivularidae. — 

 Tubes proceeding singly, 

 or in pahs, from a trans- 

 parent globule ; collects! 

 into a frond by means of 

 a gelatinous layer. 



trichia, J. Ag. 

 Kivularia, Roth. 

 Lynckia, Lyngb. 



irdotella, Bory. 

 Btylobasu, Bchw. 

 Stypnion, Etaf. 

 Zonotrichia, J. Ag. 

 Diplotrichia, J. Ag. 



Tribe 2. Oscillatorid.-r. 

 I cylindrical, free, 



or woven into a frond, 



jointed in 

 quence of the ring 



streaked appearance of 



the colouring matter. 



OBdUatoiia, I 



Oscillaria, Bosc 



Trichophora, Honnem. 



Spirogyra, Nees. 

 rulina, 'I'urp. 



/•"'■ n. Adams, 

 Trichodesmium, F.hrenb. 

 Microcoleus, Duma*. 



Vaginaria, liory. 



.U, Hxomyria, Poll. 

 Calothrlz, Ag. 



Hemp lis, Meyen. 



Ulothrix, Kiitz. 



Dilliryiullu, Bory. 

 Lyngbya, Ay. 



Cyclosperma, Bonnem. 



Iliimida, Gray. 

 Scytonenia. 



Percursaria, Bonnem. 

 Sphoeroplea, Ag. 



Cadmus, Bory. 



Spharogona, Link. 



Sphceroplethia, Duby. 

 Beggiatoa, Trev. 



Suborder IV. — ( 

 veat. -Cellules resem- 

 bling joints, arranged 

 in a net, or more fre- 

 quently in simple or 

 branched threads, se- 

 parate, or combined by 

 common slime. 



Tribe 1. Hydrodicti- 

 dx.— Cells tubular, com- 

 bined by their pointed 

 extremities into a net-like 

 frond. 



Hydrodictyon, Roth. 

 Microdictyon, Decaisne. 



THctylema, Raf. 

 Talerodictyon, Endl. 



Tribe 2. Zygnemidae. — 

 Cells tubular, united by 



lln ie truncated eitrcnti- 

 lies into jointed 

 irli iclt are at first, distinct, 

 and then, by the aid of 

 transverse tubelets which 

 discharge the colouring 

 matter, broughtinto copu- 

 lation. 



Mougeotia, An. 



Serpentinaria, Gray. 



Conjugate, Lk. 

 Zygnema, Ag, 



Agardhia, Gray. 



Glohulina, Lk. 



Stellulina, Lk. 



Lucernaria, Roussel. 



Diadema, Pal. 



Tyndaridea, Bory. 



Leda, Bory. 

 Spirogyra, Lk. 



Chodspis, Gray. 



Salmacis, Bory. 



Tribe X Confervidae.— 

 Oils tubular, united bu 

 their truncated extremi- 

 ties into free, simple, or 

 branched threads. 

 Myxonema, Fries. 



Myxotrir, Fries. 



Aematrix, Fries. 



Conferva, Fries. 



Polysperma, Vauch. 



Chloroniton, Gaill. 

 Hormiscia, Fries. 

 Nodularia, Mertens. 

 Aphanizoiuenon,. Morrcn. 

 Tiresias, Bory. 



(Bdogonium, Lk. 

 Draparnaldia, Bory. 



Charospermum, Lk. 

 Leptomitus. Ag. 



Saprolegmia, Nees. 



Pythium, Nees. 



Sji/icerotilus, Kg. 

 Achlya, Nees. 



Bydronema, Carus. 

 Hygrocrocis, Ag. 



Tribe 4. Chaetophori- 

 dae. — Cells tubular, ad- 

 hering by truncated extre- 

 mities in jointed branched 

 threads coalescing into 

 a gelatinous frond. 



Chsetophora, Schj-ank. 



Myriodactylon, Desv. 

 Ilydrocoryne, Schwab. 

 Coleochaete, lireb. 



Suborder V.— Siphonecp. 

 Frond either monosi- 

 phonous, that is, con- 

 sisting of a single cell, 

 usually branched in 

 various ways, with the 

 branches continuous or 

 jointed, distinct or 

 variously united ; or 

 pleiosiphonous, con- 

 sisting of many tubular 

 cells, placed in contact, 

 branched, and various- 

 ly united or held to- 

 gether by means of 

 intercellular matter. — 

 Marine plants usually 

 covered with calcareous 

 incrustations. 



Tribe 1. Caulerpidae. — 

 Frond monosiphonout, 



continuous, variously 

 branched, and filled with 

 the !■■ t i ciliated fibres of the 

 continuous branch. 



Caulerpa, Lamx. 



Chauvinia, Bory. 

 Tricladia, Dec. 



, 



