100 ACOTYLEDONS. ALG^E. Delesserict. 



HAB. Firth of Fortli, about Newhaven, and other places, but not com- 

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

 Mr. Chas. Cluaston. 



From 2 6 feet long, olive -green j orange by exposure to the air. 



Div. V. FLORIDE.E, Lamour. 'Fruit capsuliform and immersed 

 seeds, or both. Frond continuous^ with intenvoven longitu- 

 dinal t fibres. Substance coriaceous or membranaceous, or be- 

 tween gelatinous and cartilaginous. Colour purplish or rosa- 

 ceous. Root scutate. Stipes very 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 filiform, rarely tubular. Vesicles none, 

 and no conferva-Like hairs. 



27. DELESSERIA. 



Frond membranaceous. Fruit double. Seeds collected together 

 in spots and immersed in the leaves; and capsules. Frotidvery 

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

 regularity. Fruit 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. sa?)gitinea, stem cylindrical branched supporting simple 

 membranaceous petiolated 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. Fucus sang/iineus, 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- 

 natennd ciliated, sphaerical tubercles imbedded in the frond and 

 scattered seeds in the cilia. Turn. Ag.p.2\. Fucus si nn.osns, 

 Turn. H.F.t.35. E.B.t.S22. Fucus rnlens,Liglitf.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. 



8. D. alata, frond membranaceous extremely tender midribbed 

 linear subdichotomous, the segments alternately pinnated, sphae- 

 ricalsessile tubercles and naked scattered seeds both placed some- 

 times on the apices of the branches and sometimes on oblong pro- 

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

 al4tHS,LTgh(f.p.95\, Turn. Hist, F. 1. 160. J3../.1S37. 



