100 ACOTYLEDONS.— ALG.T,. DcUsseria. 



Hab. Firth of Forth, about Newhaven, and other places, but not com- 

 mon. Light/. Caroline Park, Mr. E. J. Maughan. Orkney Islands, 

 Mr. Chas. Cluaston. 



From 2 — G feet long, olive-green ; orange by exposure to the air, 



Div. V. Floride/E. Lamour. Fndt capsulif arm and immersed 

 seeds, or hoik. Frond continuous, xvith intcrivuven longitu- 

 dinal fibres. Substance coriaceous or membranaceous, or be- 

 tween gelatinozis and cartilaginous. Colour purplish or rosa- 

 ceous. — Root scutate. Stipesvery short, soon spreading into a 

 frond {except in the Delesserice). Leaves distinct in some, 

 confluent with the rest of the parts in others, in some none. 

 Frond either plane or fd form, rarely tubular, resides none, 

 and no conferva-like hairs. 



27. DELESSERIA. 



Frond membranaceous. Fruit douljje. Seeds collected together 

 in spots and immersed in the leaves; and capsules. — Frond wery 

 thin, reticulated (under a microscope), generally veined with 

 regularity. FrJiit naked seeds either in marginal processes or 

 innate upon the nerve, or collected in spots here and there 

 upon the frond. 



* Fronds or leaves veined. 



1. D. sanguinea, stem cylindrical branched supporting simple 

 membranaceous |)etiolated leaves between oblong and ovate 

 quite entire, the midrib producing sphaerical pedunculated cap- 

 sules and scattered leaves in oblong leafy processes. Turn. Ag. 

 p. 21. Fucm sanguineus, Lightf. p. 942. Turn. Hist. Fuc. 

 <.36. E. B. t. 1041. 



Hab. Sea-shores, not unfrequent. 



A beautiful and delicate species with leaves from 4 to G or 8 inches in 

 length, of a fine rose colour, with deeper coloured nerves. 



2. D. sinuosa, stem cylindrical branched supporting oblong mem- 

 branaceous leaves either sinuated orpinnatifid their margins cre- 

 nate and ciliated, sphaerical tubercles imbedded in the frond and 

 scattered seeds in the cilia. Turn. Ag.p.2\. Fucus sinuosus, 

 Turn. H.F.t. 35. E. B.t. S22. Fucus rubens, Lightf. p. 943. 



Hab. Shores of lona and other places, plentifully, Lightf. Coast of 



Moray, Mr. Borrer and Hook. Caroline Park, Maugh. Common 



in the Firth of Forth, Mr. Greville. 

 4 — 6 inches in length, and leaves 2 — 4 inches long. Colour a fine 



pink, with deeper nerves, dull red when dry, and, in decay, turning 



to a dirty yellow, tinged with green. 



3. D. alaia, frond membranaceous extremely tender midribbed 

 linear subdichotomousjthesegments alternately pinnated, sphse- 

 ricalsessile tubercles and naked scattered seeds both placed souie- 

 timesonthe apices ofthe branches and sometimes on oblongpro- 

 cesses originating from the midrib. Turn. Ag. p. 22. Fucus 

 alatus, Lightf. p. 951. Turn, Hiit. F. I. 160. JS, B. t. 1 837. 



