372 THE ALGiE OF GUERNSEY. 



recording of the entire indigenous flora of Guernsey, phanero- 

 gamic and cryptogamic, with the exception of the Fungi. 



Only two published lists of the seaweeds of this island 

 have come within my knowledge. The first is to he found in 

 the " Phytologist," first series, vol. I., where the late Dr. II. 

 K. Greville, the eminent algologist, communicates a list of 

 eighty-three species forming a collection made in Guernsey in 

 1841 by Mr. D. Ross, of Lasswade. Dr. Greville explains 

 that this gentleman " not being an algologist, merely took 

 such species as came in his way ; and this will account," he 

 goes on to say, " for the absence from the list of various 

 common plants, as well as of a large number of species which 

 have such a general resemblance to each other as to cause 

 them to be passed over by individuals unacquainted with their 

 forms." 



Dr. Greville's list, compiled more than fifty years ago, is 

 naturally of very great interest to us now ; its only defect is 

 that no habitats are given. However, I am happily able to 

 supply this deficiency, having myself collected all the species 

 enumerated except three, viz. : — 



Desmarestia viridis, 



Dictyosiphon fceniculaceus and 



Rytiphlsea pinastroides. 



The second list of Guernsey seaweeds is that contained 

 in the second edition of Ansted's " Channel Islands," at page 

 191. It is a bare catalogue of names, contributed by Miss Le 

 Lievre, and comprises 123 species, not 223 as erroneously 

 stated in the summary of the flora given on page 198. Thir- 

 teen of these I have not up to the present been able to discover 

 on this coast. I give their names, though as regards some of 

 them it would be advisable to have confirmatory evidence of 

 their occurrence before permamently placing them on record. 



Cystoseira barbata. Nitophyllum Gmelini. 



Fucus ceranoides. Kallymenia Dubyi. 



Sporochims pedunculatus. Ceramium flabelligerum. 



Cutleria multifida. Callith amnion arbuscula. 



Sphacelaria sertularia. Callithamnion roseum. 



Ectocarpus mertensii. Cladophora repens. 

 Dasya venusta. 



The exceeding richness of Guernsey in the matter of 

 seaweeds will be apparent on a careful study of the subjoined 

 list, which comprises a remarkable number of rarities ; and 

 many of these attain a luxuriance of growth and development 

 quite unknown on the English coasts. 



In the course of my researches it has been my good 



