Irickea.] ALGA: INARTICULATE. 307 



Turn, in Linn. Trans, v 6. p. 135. t. 10. Syn. Fuc. p. 362, 

 Hist. Fuc. t. 102. E. Bot. t. 1165. 



Only, I believe, seen among rejectamenta upon our shores and very 

 rare. Yarmouth, Mr. IVigg. Brighton, Mr. Sorrer. Folkstone, Miss 

 Everett. Sidmouth, Mrs. Griffiths. Bantry, Ireland, Miss Hutehins. 

 ©. Summer. — A highly beautiful and curious plant, with the habit and 

 much of the structure of Mesogluia, with which Miss Hutehins thought 

 it ought to be arranged. 



41. Ptilota. Ag. Ptilota. 



Frond compressed or flat, pectinato-pinnate, of a red colour, 

 between membranaceous and cartilaginous. Fructification 

 minute, aggregated : the capsules surrounded by an involucre. 

 Grev. Alg. Brit.j)- 154. t. 16. — Name; ttiXuto;, pinnated ; from 

 the extremely beautifully pinnated appearance of the richly 

 coloured fronds. 



1. P. phtmdsa, Ag. (feathered Ptilota) ; frond compressed 

 cartilaginous much and irregularly branched, the branches re- 

 peatedly pectinato-pinnated, ramuli opposite bearing the fructi- 

 fication at their apices. — Ag. Sp. Alg. v. 1. p. 385. Grev. Alg. 

 Brit. p. 155. t. 16. — Plocamium plumosum, Lamour. — Fucus\ 

 plumosus, Linn. — Turn. Syn. Fuc. p. 296, Hist. Fuc. t. 60. 

 E. Bot. t. 1308. — 1@. capillaris ; frond very narrow, the seg- 

 ments nearly cylindrical jointed. Turn. I. c.f.g — h. 



Rocky sea-shcres, frequent. — p>. Not unfrequent on the perpendicular 

 faces of rocks. If. . Summer and Autumn. — A jointed appearance is 

 visible in the young and tender parts of this plant, especially in an early 

 state. 



Tribe X. Gastrocarpe^e. 



Plants all marine, with a scutate root, qfapinkj red. of pur- 

 plish-red odour, most of them not changing much on exposure to 

 the atmosphere, of a carnose, geloMnoso-cartilaginous or gelatinosch 

 membranaceous substance; t/<< structure consisting of a cellular 

 external coat or membrane, and a pellucid gelatinous internal 

 mass, mostly traversed by colourless Jointed filaments arising from 

 the outer membrane. Frond cylindrical, compressed or flat, con- 

 tinuous, destitute of midrib or veins. Fructification; roundish 

 clusb rs or globules of red seals, imbedded in the internal gelatinous 

 substance of the frond, and often unaccompanied by any external 

 pore* Grip* 



42. [rid i \. Hon/, [ridam. 



Frond flat, expanded] oarnoes or gelatinoeo-cartilaginous, 

 more or lest of a piirpliah-red colour. Fructification; globules 

 of roundish seeds, imbedded between the two coati of toe frond. 

 Orev, Mij. Brit p. l.')7. /. 17. — Named from the iridescent hues 

 displayed by many of the species whan recent. 



