BOTANY 



the rare Stenogramme interrupta in Britain. About the same date (1861) 

 Mr. J. Boswarva, of Plymouth, published a Catalogue of the Marine Algae 

 of Plymouth, including 221 species, or rather more than half of the then 

 known British marine algal flora. 



The Rev, W. S. Hore, of Plymouth, gathered the first plant of 

 Bornetia secundifiora found in Great Britain near the Mewstone, in Plymouth 

 Sound. His remarkably fine collection of twenty-one folio volumes, con- 

 taining chiefly Devonshire seaweeds, was in 1906 presented to the North 

 Devon Athenaeum at Barnstaple by his sister at the suggestion of 

 Mr. W. P. Hiern, M.A., together with three folio volumes of mosses 

 and lichens containing many Devonshire species. In 1888 Mr. E. Parfitt 

 compiled a list of the marine algae of Devon {Trans, of the Devon Assoc, 

 for the Advancement of Science and Literature, XKi, pp. 338—82), in which the 

 number of Devonshire species was raised to 318. Two of the species 

 mentioned by him must, however, be omitted from the Devonshire flora, 

 viz., Delesseria angustissima, Ag., which is a North British species not 

 known to occur south of Yorkshire, and Ralfsia deusta. Berk., which is the 

 R. verrucosa, Aresch., the true R. deusta, Ag., not occurring in Britain. 



The list here given, in which the number of species occurring in 

 Devon is raised to 468, is probably the richest and most complete county 

 list of marine algae, except possibly that of Dorsetshire. These additions 

 are largely due to the investigations of Mr. E. M. Holmes, F.L.S., who 

 for a long series of years has visited the shores of Devon. New species 

 were also detected during the last forty years by the Rev. R. Cresswell, 

 formerly of Teignmouth ; Mr. J. Ralfs, chiefly at Ilfracombe ; Mr. J. 

 Brebner, F.L.S., at Plymouth ; and Mr. E. A. L. Batters, F.L.S. The 

 names of most of these algologists have been perpetuated in the British 

 genera Battersia, Cutleria, Griffithsia, Ralfsia, and the exotic genera 

 {Gulsonia, Holme sia, Horea), and in the species Rhodochorton Brebneri, 

 Schizothrix Cresswellii, and Nitophyllum Hilliae. The last mentioned 

 was so named in honour of Miss Hill, of Plymouth, who died in 1830, 

 and who was described by Dawson Turner as a ' most indefatigable and 

 faithful observer.' 



The following species have as yet only been detected in Devon ; 

 four of them, indicated by a !, have been issued in Mr. Holmes's 

 Fasciculi of Algae Britannica Rariores, of which eleven were issued be- 

 tween 1882 and 1905 ; these may be seen in most of our national and 

 university herbaria. 



Microcoleus tenerrimus, Gom. Ectocarpus ovatus, Kjellm. 

 Oscillatoria rosea, Batt. var. arachnoideus, Reinke. ! 



Schizothrix Cresswellii, Harv. 1 — Padinae, Sauv. 



— lardacea, Gom. ! Sphacella subtillissima, Reinke. 

 Rivularia australis, Born. Ralfsia disciformis, Cm. 

 Halosphaeria viridis, Schm. Lithoderma simulans, Batt. 

 Codiolum gregarium, A. Br. ! Acrochaetium entophyticum, Batt. 

 Prasinocladius lubricus, Kuck. Gigartina Teedii, Lamour. 

 Ulvella lens. Cm. Polysiphonia pennata, Schm. 

 Endoderma leptochaete, Hu- Rhodochorton Brebneri, Batt. 



ber. — pallens, Hauck. 



Ectocarpus Microspongium, Batt. Hymenoclonium serpens, Batt. 



— Battersii, Born. Grateloupia minima. Cm. 



Ill 



