ULVA. 



Dulfe, or Fucus palmntus, to \sliicli, tliougli growing in fo 

 different a (lation, the prefeiit Ulva lias much natural af- 

 iiiiity. The colour of both is a deep dull red, feldom 

 grecnifh, or brown, and their iubftance, when foaked, is 

 alike pulpy and mucilaginous, with a fea-vveed odour. 

 Our prefcnt plant, however, is much the fmalleft, being 

 rounded, not palmate, fcarcely notched, each frond or lobt 

 from half" an inch to two or three inches wide, generally 

 convex. Innumerable internal granulations, the feat, as we 

 prefume, of the feeds, raifc the cuticle in fuch a manner as to 

 give a roughnefs to the furface. 



17. U. rupejlris. Broad Rock Laver. Engl. Bot. 

 t. 2194. — Frond leathery, depreffed, very wide, indeter- 

 minate, fmooth and (lippery, of a dull red The only fpe- 



cimen of this remarkable vegetable that ever occurred to 

 our notice, grew on the wet (hady furface of a rock, above 

 Tyloge bridge, by the river fide, at Hafod, Cardiganfhire ; 

 the fine feat of the celebrated Mr. Johnes, fo well known by 

 his tranilations of the old French hillorians, and now fo 

 much lamented by all who truly knew him. We can com- 

 pare this plant to nothing better than a well-foaked ikin of 

 parchment, both in fize and texture, though more tender, 

 and jagged at the edges, fo that it could not be ftripped 

 entire from the rock, nor could the form of its outline be 

 afcertained. It dried fpejdily, flightly adhering to paper, 

 and (hrinking confidcrably in width ; but recovered its ori- 

 ginal appearance many years afterwards, on the application 

 of water, when numerous, minute, granular, dotted bodies, 

 prefumed to be feds, were found imbedded in the fibrous 

 fubftance under the cuticle, not projcftnig, fo as to produce 

 a roughnefs, like the montana. We cannot doubt the flridl 

 affinity of this to the kit, though they mull be fpecifically 

 diftina. 



18. U. dicbotoma. Green Forked Laver. Hudf. 568. 

 Lightf. 97 j. t. 34. Engl. Bot. t. 774. (Fucus membra- 

 naceus dichotomus graniineus ; Rail Syn. 45, according to 

 Hudfon. ) — Frond membranous, quite flat, repeatedly 

 forked, reticulated, pale-green, with linear, ohtufe fegments. 

 — Found on thecoafts of Scotland and Cornwall, in fummer 

 time. The whole plant, three or four inches high, and of a 

 wedge-fhaped or fan-like figure, is thin and flat, curioully 

 reticulated internally like a Fhijlra, or like our n. 2, U. 



jiahellform'is. The fegments are alternate, from one line to 

 three in breadth, generally notched ac the end, but other- 

 wife very entire. Seeds blackidi, difperfed, with a ferics of 

 imbedded bladders, between them and the margin of the 

 leaf. 



19. U. Linza. Ribband Laver. Linn. Sp. PI. 1633. 

 Ilndf. 56.S. Fl. Dan. t. 889. (Tremella marina fafciata ; 

 Dill. Mufc. 46. t. 9. f. 6. Linza; Imperato 111. Nat. 651.) 

 — Frond oblong-lanceolate, folded, green, lomewhat undu- 

 lated and cellular. — Native of lalt-water ditches, and receffes 

 of the fea among rocks, in various parts of Europe. Its 

 form is oblong, ribband-like, acute, when full-grown folded 

 and wavy, always membranous and pellucid ; its length a 

 foot or more. Mr. Turner in Tr. of Linn. Soc. v. 7. 108, 

 records, that he found the original foecimen of this in the 

 Dilleniari herbarium to confift of two long narrow pieces of 

 different things, U. Laduca and umLiitcalis. The figure 

 however reprelents what we underttand by U. Linza, and 

 agrees with Fl. Dan. Mr. Turner affords us, in the place 

 jull cited, a dill more curious piece of information, that the 



U, lanceolala of LinHxus, taken up in his Syil. Nat. ed. 12. 

 v. 2. 719, from DiUeniiis, is no other 'than U. Linza, the 

 figure in Hill. Mufc. t. 9. f. 5. reprefenting fcveral indivi- 

 duals of that fpecics, as palled in the herbarium, with their 

 tops downward, crowded together, and the roots upward 1 



Thefe were communicated, it feems, by Mr. Brewer, from 

 the Ifle of Man, and appear to be young plants, not yet be- 

 come wavy or folded. 



Sedl. 2. Frond concave, or tubular. 



20. U. inlejlinalis. Gut Laver. Linn. Sp. PI. 1612. 

 Hudf. 568. (Tremella marina tubulofa, intellinorum figura ; 

 Dill. Mufc. 47. t. 9. f. 7. Cava; Imperato III. Nat. 651.) 



— Frond tubular, menjbranous, green, irregularly cellular. 



Common in falt-water ditches and pools, throughout Eu- 

 rope, attached to (tones and rocks. The frond is occafionally 

 branched, according to Dillenius. Young plants hardly 

 exceed a ilraw in thicknefs, and are even in furface, of a 

 yellowifli or brownifh colour ; but when full grown they 

 become an inch or two in diameter, varioufly cellular, like a 

 cabbage-leaf, and of a fine green ; often floating to the fur- 

 face, inflated with air, eighteen inches or two feet in length. 

 In this llate they refemble, except colour, the inteftines of 

 feme animal. Nothing is known refpefting the feeds, 

 which are probably perfected and diffeminated at tlie pefiod 

 jull defcribcd. 



l.\.\5.compreJfa. Compreffed Laver. Linn.Sp. PI. 1632. 

 Hudf. 569. Engl. Bot. t. 1739. (Tremella marina tenu- 

 ifiima etcompreffa ; Dill. Mufc. 48. t. 9 and 10. f. 8. Con- 

 ferva compreffa ; Roth Catal. v. i. 161.) — Frond tubular, 

 more or lefs branched, compreffed, irregularly conllricled, 



green; the branches elongated Common on fubmarine 



rocks, ftones and pods, as well as in fait ditches, throughout 

 Europe. Dr. Sibthorp noticed this, along with the laft, in 

 the fea near Conftantinople. The fronds grow in tufts, ex- 

 tremely variable in fize, and from two inches to a foot or 

 more in height, each of them very (lender at the bafe, where 

 alfo they are moil branched ; the branches are often greatly 

 enlarged upwards, but frequently nearly cylindrical ; they 

 are interrupted here and there by ilriftures, at each of which 

 the internal cavity (eems divided by a tranfverfe membrane. 

 Hence Necker and Roth made this plant a Conferva, but 

 furely without fufficient reafon. The furface is even and 

 fmooth ; the colour fine green. 



22. U. ramulofi. Green Sharp-branched Laver. Engl. 

 Bot. t. 2137. — Frond tubular, very much branched, fonie- 

 what compreffed, green ; ultimate branches fcattered, ex- 

 tremely numerous, (harp-pointed. — Dilcovered by Mifs 

 Hutchins, in Bautry bay, Ireland. A very elegant fpecies, 

 remarkable for the innumerable little branches, fcattered 

 over each principal ramification, which give it the afpeft of 

 a Conferva. The height of the tufted fronds is three or 

 four inches ; their colour a beautiful given ; and the fur- 

 face, under a moderate magnifier, is louiid curioufly and 

 unitormly dotted, perhaps wxihfeds. The fubllance of the 

 plant is a little gelatinous, being far lefs membranous than 

 U. compreffa. 



23. U. piirpurafcens. Purplilh Laver. Hudf. 569. 

 Woodw. Tr. of Linn. Soc. v. 3. 52. Engl. Bot. t. 641. 

 — Frond tubular, branched, nearly cylindrical, purpli(h- 

 brown ; branches mollly oppofite, fimple or compound, 

 acute. — This grows on fubmarine rocks and (lor.cs, lu 

 various parts of the I'outh coall of England, being in per- 

 fedlion about the middle of fummer. Several_/Von(//, about 

 fix inches high, (pring from. one fmall cartilaginous di/k. 

 Each, like its branches, tapers coiifiderably at the top and 

 bottom, (welling in the' middle, to a line or two m diameter. 

 The branches are two or three inches long, generally oppo- 

 fite, and in feme degree two-ranked. fcir Tliomas Frank- 

 land has favoured us with a repeatedly compound fpccimen, 

 a foot long, 'i'iie whole plant is juicy, of a light reddifli- 

 brown, fmooth and even, with little black feeds fcattered 

 copioufly and irregularly jull under the cuticlv. Light- 

 fool '1 



