212 . Bibliographical Notices. 



of the ' British Flora' (or ' English Flora,' vol. v. part 1.), the ' Flora 

 Hibernica,' and Berkeley's ' Gleanings of British Algae,' was very 

 much required, will at once be evident when we enumerate the great 

 accessions made to this most attractive department of our native bo- 

 tany. These are really most surprising, when it is considered that 

 the works just named have all been published within the last very 

 few years. 



We have in this Manual thirty species described for the first time 

 — these are, three Ectocarpi, a second species of Myriotrichia, a 

 Nitophyllum, a Polysiphonia, a Ceramium, four Conferva, a Scytonema, 

 a Calothrix, three Palmellte, a.Nostoe, ixMeloseira, &Styllaria, a Gom- 

 phonema, seven Schizonemte, and three Cymbella. 



Eleven species before known only as foreign, and belonging to as 

 many genera, are for the first time added to the British flora, — 

 they are Laminaria fascia, Ag., Mesogloia moniliformis, Griff. (M. 

 , attenuata, Ag.), Polysiphonia formosa, Suhr., Callithamnion barba- 

 tum, Ag., Thorea ramosissima, Bory., Conferva refracta, Ag., Hydru- 

 rus Ducluzelii, Ag., Hygrocrocis Rosce, Ag., Meloseira varians, Ag. ?, 

 Styllaria bidentaia, Ag., and Schizonema ramosissimum, Ag. Ten 

 species, announced in different scientific periodicals since the pub- 

 lication of the three works just alluded to, here for the first time, 

 in a consecutive work on the British Algae, fall into the ranks in 

 systematic order. The genera Thorea and Hydrurus are published 

 for the first time as British, whilst Aphanizomenon and Anabaina 

 make their earliest appearance in a systematic work upon our 

 Algae. A new genus which he calls Eutomia is proposed by the 

 author for the Echinella rotata, Grev., and Ech. oblonga t Grev. ; and 

 he proposes to substitute Helminthocladia for Trichocladia of the 

 ' Flora Hibernica,' in consequence of the latter so nearly approach- 

 ing Trichocladus in sound. The much-disputed plant lastly named 

 Delesseria alata, var. /?. angustissima (' Brit. Fl.' vol. ii. p. 286), is 

 raised to the rank of a species by the name of Gelidium ? rostratum, 

 but it still remains a desideratum to what genus it belongs ! 



What will perhaps be almost equally interesting to many of the 

 lovers of this delightful portion of our flora, will be found in Mr. Har- 

 vey's volume in the additional localities enumerated for species with 

 which they have already become familiar ; and here we particularly 

 mark the progress that has been made since the excellent introduc- 

 tion to Greville's ' Algae Britannicae' appeared — genera and species 

 there particularized as known only to the British Islands, from being 

 found on the southern shores of England, being now ascertained to 

 range to the northern coasts of Ireland. 



We are greatly pleased with the comprehensive manner, the en- 

 tireness with which the general subject of Algae is brought before us 

 in the Introduction. This extends to fifty-seven pages, and affords 

 a most gratifying illustration of the addition made to our know- 

 ledge as the stream of time rolls on. Already in our language have 

 Dr. Neill in his Encyclopaedia article on Fuci, and Dr. Greville 

 in the introduction to his ' Algae Britannicae,' treated admirably of 

 the general subject ; but here we have it brought down to the pre- 

 sent period, and by a botanist, than whom perhaps no one living is- 



