ULVA. 



foot's Fucus verticillatus, Fl. Scot, t.jl, a plant we have 

 never examined, is cited for this ifl'va by Mr. Hudfon, 

 p. 66l ; but the figure reprefents numerous ftrittures in the 

 main branches, with compound, whorled, capillary fubdi- 

 TiCons, nothing like which occurs in our fpecimens. 



24. \5 . fjlulofa. Pipe Laver. Hudf. 569. Woodw. 

 Tr. of Linn. Soc. v. 3. 52. Engl. Bot. t. 642. — Frond 

 tubular, uniform, fimple, bluntifh, a little zigzag, gelatinous, 

 yellowiih-brown. — Found at Falmouth, and other parts of 

 our fouthern coaft. Mr. Hudfon attributes to this fpecies 

 a creeping root. The fronds grow in clutters, ereft, three 

 or four inches high, being ftouter than the laft, and con- 

 ftantly unbranched ; their furface uneven or gibbous, with 

 fome appearance of ilriclures ; their bafe tapering ; their 

 termination abrupt and bluntifh. Seeds very minute, fcat- 

 tered through the foft fubftance of the frond, vifible by 

 their dark colour, contrafled with its very pale brownifh- 

 yellow. 



i^.U.Turneri. Reticulated Laver. Engl. Bot. t. 2570. 



Frond membranous, tubular, fimple, bluntifh, brown, 



finely reticulated. Seeds in little patches. — Found by 

 Mifs Hutchins, in Bantry bay, Ireland, and by Mr. Borrer, 

 on the Suffex coafl. The name is a manufcript one of 

 Mr. Dillwyn, who is faid to have been long preparing a 

 treatife on Ulva, which, if we may judge by his excellent 

 performance on Conferva, cannot but prove a great accefGon 

 to cryptogamic botany. Several fronds grow together, 

 but apparently not connefted, bearing a great refemblance 

 to the laft in height, figure, and fomewhat in colour, though 

 darker, rather thicker, and, when cut acrofs, difplaying a 

 more membranous fubftance, which is finely reticulated 

 throughout. The feeds moreover differ effentially, being 

 collefted into little [irregular patches. 



26. U. rugofa. Corrugated Cape Laver. Linn. Mant. 

 311. — Frond membranous, tubular, branched, corrugated, 

 tuberculated, dark brown ; branches two-ranked, burfting 



at the extremity Gathered by Koenig in the fea near the 



Cape of Good Hope. The fronds are four or five inches 

 long, and about half an inch thick, befet with many fimple 

 branches, fpreading in two ranks, each branch from an inch 

 and half to three inches in length, not fo thick as the main 

 ftem ; their point of infertion much contracted ; their ex- 

 tremity moftly open and tubular ; their rugged furface 

 befprinkled with flightly prominent, umbilicated, minute 

 prominences, in every one of which a feed appears to be 

 imbedded. 



Se£t. 3. Frond Jiejloy, folid. 



27. U. diaphana. Pellucid Flefhy Laver. Hudf. 570. 

 (Alcyonium ge'.atinofum ; Linn. Syft. Nat. v. i. 1295. 

 A. n. 5 ; Ellis Cor. 87. t. 32. f. d, D. Fucus fpongiofus 

 nodofus ; Ger. Em. 1570. Urtica marina nodofa ; Bocc. 

 Muf. 269. t. 5. f. 13.) 



/3. U. fiavefcens; Hudf. 570. (U. diaphana; Engl. Bot. 

 t. 263. Alga minor fiavefcens, varie divifa ; Mart. Cent. 



'•32-) 



Frond gelatinous, folid, tumid, pellucid, roundifh or 



compreffed, with numerous irregular branches. 



This fingular marine production, referred by Linnaeus and 



Pallas to the animal kingdom, feems by its fcent rather of a 



vegetable nature, betraying no figns of animal life, and 



having the charafter of an Uiva very apparent, in the diftri- 



bution of what we prefume to be the feeds ; to fay nothing 



of its drying as well as any very juicy fea-weed, though its 



fubftance is io extremely fpongy and watery. The common 



appearance of this Uha, as found on our coafts, exaftly re- 



fcmbles wet fea-fand in colour. Its length is feveral inches, 



the mainj^fm, which fwells upward, being befet with irre- 



gular feries of knobby branches, more or lefs acute. The 

 very copious imbedded feeds are brown, very fmall. Our 

 more uncommon variety ^, erroneoufly figured in Engl. 

 Bot. as the true diaphana, though the defcription compre- 

 hends both forts, differs from the above-defcribed, in its pale- 

 yellow colour, refembling barley-fugar [or fucre brule) ; the 

 branches are faid by Hudfon, who neverthelcfs fufpefted it 

 might prove but a variety, to be more obtufe ; this charafter 

 however is variable. 



28. U. defraSa. Broken Laver. With. v. 4. 124. 

 t. 18. Engl. Bot. t. 1626. — Frond thread-fliaped, folid, 



unbranched, elaitic, vifcid, pellucid, with pale red dots 



Found by Mr. Brodie of Brodie, on the eaft coaft of Scot- 

 land, and by the late colonel Velley on tlie beach at Wey- 

 mouth, at low water. The tender delicate plants of this 

 fpecies grow entangled amongft other marine vegetables, 

 twifted together like worms, of a very pale flelh-colour to 

 the naked eye ; each being from two to twelve inches long, 

 fimple, brittle, bluntifh, very glutinous, (hrinking up to 

 nothing when dried. The minute pink dots, fcattered over 

 the white furface, and prefumed to contain the feeds, change 

 gradually to an orange hue. 



29. U.fitiformis. Thread-fhaped Laver. Hudf. 570 



" Frond gelatinous, thread- ihaped, much branched, purphfti ; 

 branches Icattered, diftant, very long." — Native of fubma- 

 rine rocks and ftones, near Chriftchurch, Hampfhire. An- 

 nual, occurring from April to September. Frond fix inches 

 long, the thicknefs of packthread ; the branches obtufe. 

 Hudfon. We are unacquainted with this fpecies. 



30. U. capillaris. Capillary Laver. Hudf. 571. — 

 " Frond gelatinous, thread-fhaped, much branched, pale ; 

 branches alternate, capillar)-, acute."— Found in fimilar 

 fituations with the preceding, near Chriftchurch, and elfe- 

 where, in Hampfhire, as well as at Margate. Annual ; 

 from May to Oftober. The frond k four inches long, folid. 

 Hudfon. This (hould feem to be very little different from 

 the laft. 



31. U. rubens. Reddifh Short-branched Laver. Hudf. 

 J71. — Frond gelatinous, thread-fhaped, equal, reddifh or 

 greenifh, much branched ; branches fcattered, horizontal, 

 obtufe. — Found by Mr. Hudfon on fubmarine rocks and 

 ftones, in Portland ifland, and near Pool, Dorfetthire. 

 Annual ; from May to October. Frond four inches long, 

 of nearly equal thicknefs throughout, of the diameter of 

 fmall packthread, divided into feveral alternate or fcattered 

 principal branches, each of which is befet with numerous 

 others, all horizontal, fhort and blunt. Little \Az!:.\i feeds 

 are fcattered under the cuticle. An authentic fpecimen of 

 this, and many other fea-weeds, defcribed by Hudfon, were 

 given to the younger Linnaeus by fir Thomas Frankland. 

 We are alio poffelfed of another, found by the fame gentle- 

 man at Scarborough, in Auguft 1 807, which is fix inches 

 high, green, with very copious branches of the fame thick- 

 nefs as above defcribed ; the internal fubftance of the main 



flein, in the lower part, appearing very firm and horny, like 

 a coralhne. Notwithftanding the difference of colour, we 

 cannot doubt tlie identity of the fpecies. 



32. U. rubra. Crimfon Laver. Hudf. 571. Engl. 

 Bot. t. 1627 — Frond gelatinous, much branched, forked, 

 thread-fhaped, unequal, fomewhat flattened, bright red, 

 fmooth. — Found by Mr. Hudfon, near Chriftchurch, 

 Hampfhire, and by fir Thomas Frankland on the Scar- 

 borough coaft, in Auguft. Several fronds, from an inch 

 and a half to three inches high, fpring from a fmall callous 

 difl.:. They are taper at the bafe, much branched and va- 

 riortfly dilated, efpecially the principal ftem, which is moft 

 flattened ; the ultimate divifions forked, or aggregate. The 



colour 



