Additional Notes on the Alr/ce of the Firth of Forth. 189 



into a distinct species, and gives it the name 

 Cladostejjhus distichus. Mr Holmes, in a paper 

 recently read before the Royal Microscopical 

 Society of London, has pointed out that this 

 plant is distinguished by bearing both the pluri- 

 locular and nniloctdar sporangia in minute special 

 branches, which form a short down surrounding 

 the main branches, as in Cladostephics, while the 

 typical Chcetopteris plumosa bears sporangia on 

 the ordinary ramuli and not on the axis. 



5. Dictyosiphon foeniculaceus, sub-species flaccidus, Ares- 



choug. — In muddy pools, at about half tide, 

 North Berwick ; parasitical on Phlceospora tor- 

 tilis, August 1881 ; new to Britain. 



6. Phlceospora tortilis, Areschoug. — In muddy pools, at 



about half tide; Joppa, May 1880; Pettycur 

 near Kinghorn, Elie, and North Berwick, 1881. 

 Annual, March to August, inclusive. 



7. Fctocarpus longifructus. — Dunbar, in pools at half tide ; 



rare. 



8. Callithamnion hyssoideum. — Elie, on rocks at half tide ; 



rare. 



9. Callithamnion mesocarpwm. — Joppa, on muddy rocks at 



very low tides. 



10. Phyllophora (new species). — Joppa, near Granton quarry, 



etc., on rocks at very low tides ; often accompany- 

 ing Sphacelaria radicans and Chmtopteris plumosa, 

 1880. Perennial, fruiting in winter; new to 

 Britain. 



11. Pohjsiphonia ihuyoides. — Broxmouth, near Dunbar, 



1880 ; rare. 



12. Cordylecladia erecta. — Joppa, at very low tides, grow- 



ing half immersed in sand ; rare. 



13. Dermocarpa prasina, Bornet. — Parasitical on Catenella 



opitntia at Caroline Park rocks, 8th Jan. 1881 ; 

 Longniddry and Lady's Tower, Elie. Found 

 originally by Mr Cresswell at Teignmouth in Jan. 

 1880, parasitical on Callitliamnion Rothii, when 

 new to Britain. 



