74 BOTANICAL RESULTS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



in not being coriaceous, in its smaller size, thicker thallus, and longer narrower cells 

 as seen in section. 



Reinsch, in his list of South Georgian Algae (p. 420), quoted above, describes a new 

 variety, macrogyna of Ulva Lactuca. This plant is, he says, composed of a single 

 layer of cells, those at the base being very longly caudate. The former of these 

 characters would place Reinsch's plant in Monostroma rather than in Ulva. The habit 

 of var. macrogyna is, however, quite different from that of M. endiviaefolium. It is 

 broad, large and flat like Ulva Lactuca, and the size of the cells is much smaller than 

 that of our plant. If we regard var. macrogyna as a Monostroma, these two plants are 

 the only Antarctic species of the genus known to us. 



2. ULVA LACTUCA, L. St Vincent, December 1, 1902. 

 Geographical Distribution. Cosmopolitan. 



3. CH^ETOMORPHA, sp. A fragment. Between Rio and Bahia, off the coast of Brazil, 

 December 20, 1902, lat. 18 24' S., long. 37 58' W. 



4. MICRODICTYON UMBILICATUM, Zan. Off Brazil, same locality as No. 3. 

 Geographical Distribution. Mediterranean, Warm Atlantic, Warm Pacific, Indian 



Ocean, Red Sea 



5. BRYOPSIS PENNATA, Lam. St Paul Rocks, December 10, 1902. Surface. 

 Geographical Distribution. Warm Atlantic, Indian Ocean. 



6. CAULERPA RACEMOSA, J. Ag., var. L^TEVIRENS, forma CYLINDRACEA, Web. v. B. 

 St Paul Rocks, December 10, 1902, lat. 58' N., long. 29 20' W. Shore. 



Geographical Distribution. Warm Atlantic, Indian Ocean, Australia. 

 Var. UVIFERA, Web. v. B. Off Brazil, same locality as No. 3. 

 Geographical Distribution. West Indies, Indian Ocean, Friendly Islands. 



7. C. MURRAYI, Web. v. B. Off Brazil, same locality as No. 3. 

 Geographical Distribution. Victoria Banks, Brazil. 



8. CODIUM TOMENTOSUM, Stackh. Off Brazil, same locality as No. 3. 

 Geographical Distribution. Mediterranean, North Atlantic, Cape of Good Hope, 



Indian Ocean, Red Sea, North Pacific, Australia. 



9. SARGASSUM VDLGARE, Ag. Off Brazil, same locality as No. 3. St Vincent, shore, 

 December 1, 1902. 



Geographical Distribution. Warm Atlantic. 



The first record consists of fragments of plants with few and widely scattered leaves. 

 The second specimen has many and crowded leaves, which are smaller than those of the 

 Brazil specimens. The St Vincent plants agree exactly with specimens collected by 



