390 NEW OR CRITIGAL BRITISH MARINE ALG.E. 



Callithamnion spar sum preserved in the Hookeriau Herbarium. In 

 habit they resemble either Acroclmtia or Rhodoclior tones, but, as I 

 was fortunate enough to find on the first fragment I examined a 

 few axillary monospores, I am satisfied that the plant should be 

 referred to the genus Acrochmtixun ((Jhantrcmsia). The Bkodochorton 

 spar sum of my List of Berwick Alga;, although it is, I believe, the plant 

 visually so called by British authors, is very different from 0. 

 sparswii Carm., and appears to be distinct from any described form 

 of Bkodochorton. It is closely related to B. Bothii Niig., but can at 

 once be distinguished from that species by its parasitic habit and 

 scattered mode of growth, not to mention the difference in habitat 

 of the two species, B. Bothii growing only on rocks and near high- 

 water mark, while B. parasiticum is always parasitic on the stems 

 of Laminaria hyperhorea at extreme low-water mark and beyond. 

 I have seen no authentic specimen of Kjellman's B. sparsum, but 

 most probably it is identical with the plant described above. 



16. LiTHOTHAMNioN iNCRusTANs Foslio, "Norwegian forms of 

 Lithotham7iia" {Det. Kijl. Norske Videnskahers Selskuhs SkriJ'ter, 1B94, 

 94, pi. 18). Chapman's Pool, Dorset, and Cumbrae, E. A. B. 



f. Harveyi Foslie, I. c. pi. 18, figs. 12-15. Cumbrae, E.A. B. 



17. LiTHOTHAMNioN SoNDERi Hauck, Mceresalfj. 273, pi. 3. Cum- 

 brae, E.A. B. Isle of Man, B. Harvey Gibson. 



18. LiTHOTHAMNioN ORBICULATUM FosHe, I. C. 143, t. 22, figS. 



10-11. Arran, E. A. B. Sea Mill, E. M. Holmes. 



19. LiTHOTHAMNioN FLABELLATUM Roseiiv. Gronl. Havahj. 112, 

 figs. 1-2. 



f. Bosenvinqii Foslie, /,. c. 70. Isle of Man, Bi. Harvey Gibson. 

 f. Granii Foslie, /. c. 70, tab. 17, figs. 1-7 et 22. Port Banna- 

 tyne, Bute, D. Bobertson. 



20. LiTHOTHAMNioN Str5mfeltii FosHe, /.. c. 145. Bognor, E.A.B. 

 Plymouth, G. Brebner S E. A. B. 



21. LiTHOTHAMNioN Lenormandi (Arescli.) f. subliBvis Foslie /. c. 

 151. Berwick, i?. J. S. 



22. Lithothamnion Battersii Foslie, New or Critical Litho- 

 thamnia, 1, figs. 1-5. Cumbrae, E.A.B. 



23. Lithothamnion corallioides Crn. Fl. Finist. 152, t. 20. 



f. australis Foslie, Norw. Lith. /. c G2, tab. 16, figs. 24-31. 

 Cumbrae, E.A. B. 



i. flabelliyera Foslie, I.e. 62, tab. 16, figs. 32-37. Cumbrae, 

 E.A.B. Port Bannatyne, Bute, D. Bobertson. 



