MARINE ALG^E. 9 



While referring to the southern species of Desmarestia, it may be worth while to 

 point out a slight error in the key to the species which Reinsch publishes in Flora, 1888, 

 pp. 189, 190. He classes 1~). chorda/ it* with D. viridis as having its ultimate pinnules 

 uucorticated. He had apparently never seen D. chordalis, and he misinterpreted 

 Harvey's "apice longe nudis" (Flor. Autarct. Part II., p. 467) as meaning uncorticated, 

 whereas it simply means unarmed with spinules. We would point out that in D. 

 ham'i/ana the axial hyphse are corticated to the very tips of the ultimate ramuli 



(tig. 12). 



5. ECTOCARPUS GEMINATUS. 

 Ectocarpus geminatus Honk, et Harv., Loudou Journal of Botany IV. (1845) p. 251. 



Cape Aclare, with plurilocular sporangia, epiphytic on Desmarestia harvet/i/n,/. 



Geogr. Distr. Cape Horn, Falkland Islands, Kerguelen. 



This species is well figured by Hariot in Mission Scientifique du Cap Horn 

 (1882-3), torn. v. 1889, Algae, pi. 3, figs. 1, 2. Our attention has been called by Dr. 

 Carl Skottsberg to Reinke's note in the Atlas Deutscher Meeresalgen II. 1892, p. 46, 

 where he proposes to transfer this species to the genus Isthmoplea. 



FLOKIDE.E. 



G. IRID.EA MICANS. 



Iriikra wintns Bory, Voyage C'oquille, 1828, p. 110, tt. 13, 13' lis . 



McMurdo Strait, upon the ice of Bay between Black and White Islands, among a 

 heap of sandy matter, a mile north of rock-debris heaps, five miles north of tide-crack 

 at head of bay, September 14, 1902. 



Geogr. Distr. Falkland Islands, Cape Horn, Valparaiso, Auckland Islands. 



A fruiting specimen, weathered, failed and fragmentary. 



7. GRACILARIA sp. 



Off Cape Wadsworth, Coulman Island. 



A fragment without fruit. The habit is that of G. midt I partita, and a transverse 

 section of the thallus shows the large thick-walled inner cells, surrounded by smaller 

 ones. 



8. GRACILARIA SIMPLKX. 



//. .iinifilf.i; (Ji'pp, . [cumuli of Botany. I'.m.'i, p. I'.i.'i. 

 Lrjitiixinrti Kimplt'.r nob. op. rit. r.ni;>, pp. IDS, 102. 



Frondes plures (8-10) e ealln miuuto ortse simplices oblongae vel lato-cuneatse 

 planse membranacae, 10-15 cm. longae (apice destructo), 3-8 cm. latae, c. 230/i 



%'OL. III. 2 M 



