VL-MAEINE ALG^E OF THE SCOTTISH NATIONAL 

 ANTARCTIC EXPEDITION. 1 



P>y A. GEPP, M.A., British Museum, and Mrs E. 8. GEPP. 

 (With Two Plates.) 



THE following is a combined list of the marine algse brought back by the Scottish 

 National Antarctic Expedition, and communicated to us by Dr R. N. Rudmose Brown. 

 They were gathered partly in the cold southern waters of the South Orkneys, and partly 

 in tropical and subtropical waters off the coast of Brazil, at St Paul Rocks and St 

 Vincent, Cape Verde Islands. The South Orkneys He about 45 W. long, and 61 

 S. lat. ; they are therefore situated outside the Antarctic circle, and far to the south- 

 east of Cape Horn. No algae had previously been recorded from these islands, so far as 

 we are aware, the nearest being from South Georgia, and described by P. F. Reinsch in 

 Neumayer's Internationale Polarforschung, 1882-83: Die Deutschen Expeditionen, 

 Bd. ii. (1890), pp. 366-449. 



CHLOROPHYCE.E. 



1. MONOSTROMA ENDIVLEFOLIUM, A. and E. S. Gepp in Journ. of Bot., xliii., 1905, 

 p. 105, tab. 470, figs. 1-5. 



Thallus sessilis, subnigrescenti-viridis, membranaceus, callo vix ullo, mox expansus, 

 maxime et dense crispato-undulatus, haud laceratus, parvus, 2-4 cm. altus et latus, 

 60-67 n crassus ; cellulis geminis vel quaternis, in sectione thalli transversal! verticaliter 

 rectangularibus, angulis rotundatis ; cellulis basalibus longissime caudatis. (Figs. 1-5.) 



Habitat. Shore pools and exposed at low tide, February 4, 1903, Saddle Island, 

 South Orkneys. 



The nearest allies of M. endivitefolium are M. Blyttii, Wittr., and M. splendens, 

 Wittr. From M. Blytii it differs in having an excessively crisped, not lacerate, frond, 

 and in being smaller. Also the cells of M. endiviiefolium seen in surface view are more 

 widely separated than those of M. Blyttii. From M. splendens it differs in colour, 



1 The majority nf the notes that follow, and of the figures that illustrate them, were published previously in the 

 following papers: "Antarctic Algai" (in Journ. of Bot., xliii., 1905, pp. 105-09, tab. 470); "Atlantic Algie of the 

 Scotia " (torn, cit., pp. 109, 110) ; " Leptosarca : a correction " (torn, cit., p. 162) ; " More Antarctic Alga; " (torn, cit., pp. 

 193-196, tab. 472) ; "A New Species of Lessonia" (op. cit., xliv., 1906, pp. 425, 426) ; "Marine Algie" (in National 

 Antarctic Expedition, in., British Museum (Natural History), 1907, 15 pp., 4 plates). 



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