320 Mr George Traill on the 



NEMALEON, Duljy. 



120. Nemaleon multifidum (Web, and Mohr), J. K<^. 



On rocks and shells near low-water mark in exposed places. 

 Cast ashore south of tStromness, at Hoy Sound (J. W. Gray). 

 Found also by Mr PoUexfen. 



SCINAIA, Bivona. 



121. Scinaia fxu'cellata (Turn.), Bivona. {Ginnania furccllata, Mont.) 

 Usually on rocks, stones, and shells, &c., from low-water mark 



to deep water. Annual. Summer. Dredged by Dr M'Bain in 

 Deer Sound, 15 fathoms, coral bottom, in fruit, with very broad 

 fronds, and having unusually bright colour, attached to shells. 

 Very rare. Identified by Harvey. This is the variety subcostata of 

 J. Agardh. 



Family.— CERAMIACE/E. 



RHODOCHORTON, Nag. 



122. Rhodochorton membranaceum, Magnus. 



This plant was found by Mr Pollexfen more than fifty years ago 

 epiphytic on a Sertularia in a rocky pool at the " Point of the 

 Mount," Kirkwall Bay. Professor Harvey wrote on a specimen he 

 examined, " Parasitic Callithamuion, new to me." It is now pro- 

 nounced by Mr Batters to be this Rhodochorton described by 

 Magnus. 



123. Rhodocliorton floridulum (Dillw.), Nag. {Callitlmmnion Jlm-i- 



dulum (Dillw.), Ag. ) 



On sandy rocks and muddy places near low-water mark. Usually 

 dry at ebb tide, and exposed to the light for several hours daily. 

 All the year. Fruit in autumn and winter. Skaill, West Main- 

 land ; Inganess Bay, line ; Kirkwall Bay, &c. Common. 



124. Rhodochorton Rothii {Eng. Bot.), Nag. {Callitlmmnion Rothii 

 (Linn.), Lyngb.) 



On rocks near high-water mark. Usually in the shade, and always 

 at places which are uncovered at ebb tide. Perennial. Fruit in 

 winter. Sanday, Crossiecrown, Saverock, &c. 



125. Rhodochorton sparsum (Harv.), Kjellm. {Callithamnion spar sum, 



Harv. ) 



Epiphytic on stems of Laminaria hyperhorea at Brocli in Rousay, 

 1887 (G. W. T.). Annual. Summer and autumn. 



ANTITHAMNION, Niig. 



126. Antithamnion floccosum (Miill.), Kleen. {Callithamnion floccoswm, 



Ag.) 

 Usually occurs on rocks at about the low-water mark of spring 

 tides ; also epiphytic on Lammaria Mjperhorea. Annual. Spring 

 and summer. 



