254 Transactions. 



plant scarcely four inches in length, grows in tufts on rocks 

 between tide marks at Douglas Hall and Colvend. F. Ceranoides 

 at the mouth of Nith near Glencaple. 



Himanfhalia Lorea, or sea thongs, grows on the rocky shores 

 at low water mark and is frequently washed ashore with spring 

 tides. Desmarestia aculeata is a representative of the second 

 (ys:A.%x — StorochnacecR — occasionally met with growing in pools on 

 the Colvend coast. Order III. — Laminariacea is represented by 

 Alaria esculenta, occasionally washed ashore in winter ; Laminaria 

 digitata and L. Saaharina, frequently met with along the Caer 

 laverock shore ; and also Chorda filum in winter and spring. The 

 plants in the next three orders grow attached to rocks at low 

 water, or in tidal pools, but I have only been able to distinguish 

 one genus — Dictyosiphoji — from Ruthwell. 



Sub-Class II. — Rhodospennea. — The plants in this sub-class 

 differ in texture and coloui', and the frond is more or less jointed, 

 as you will notice from the specimens exhibited. OdontJialia 

 dentata, frequently met with on the coasts of Fife, should be found 

 at Colvend. Polysiphonia nigrescens, P. fastigiaia, are very fre- 

 quently met with on the stems of Fucus nodosus. Laiirencia 

 pimiatifida, or pepper dulse, found growing on stones at Colvend. 

 Corallina offici?ialis grows on the rocks at Douglas Hall, &c., and 

 Delesseria sanguinea, D. alafa, grow attached to the stems of the 

 Laminaria. Plocanium coccineum is abundantly met with along 

 the whole coast, and is a great favourite with every sea-side visitor. 

 Rhodymenia palmetta, dulse, not so frequently used for dietetic 

 purposes as formerly, grows attached to the rocks, and the lesser 

 dulse, Iridoca edulis, is occasionally met with among the larger 

 seaweeds attached to the rocks. Several species of the Ceramiacece 

 may be found in the waters of the Sol way. Ceramitim rubruin, 

 C. roseuui, C. Turner! are occasionally gathered growing on the 

 larger seaweeds. 



Sub-Class III. — ■Chlorospemieie. — The grass-green seaweeds 

 are represented by the Siphonacea, Confetvacece, attd Ulvacece, 

 among which Cladophora rupesirts, common ; Conferva rupestris, 

 C. All'ida, Entcronwrpha intestinalis, and Ulva latissinia are fre- 

 quently met with on the sand shores at Caerlaverock and 

 Kuthwell. 



