12 M. FOSLIE, (Schued. Sud|jolar-K\|). 



mostly roundish-flattened. The disc is less overarched than in Litlioph. incruslaiis. 

 The sporangia are tetrasporic, 60—100 ii long and 30 — 50 ,t( broad. 



I have formerly mentioned that Lithoph. capitiilatinn Hevdk. has to be referred 

 to the species in question. It seems to me to have to be considered as a stunted 

 form of the species. On one side it is connected with f. circumscripta, but differs 

 from it by less regular and often comparatively thicker crusts partly caused by 

 growing over and covering up extraneous objects, e. g. tubes of Serpulides, and on 

 the other hand it bears a strong resemblance to young or particularly feebly deve- 

 loped specimens of f. tvpica. Authentic specimens which 1 have had the opportunity 

 of examining, partly overgrow Litlioph. dccipiens. 



L. discoidcuiii occurs parth' in lagoons in the litoral region, partly in the sub- 



litoral region, where it descends to a depth of about 14 fathoms. It very often 



overgrows Litliopli. dccipiens, and particularly in the sublitoral region it also occurs 



■ associated with Litlioth. rugosniii, A. graii/difennn and L. magellaiiiciiin. It has 



been found with ripe sporangia in July and in December. 



Area: Patagonia, f. circumscripta (locality unknown); near the mouth of Rio 

 Grande, f circumscripta (DusEN); unknown locality (WILLEMS and ROUSSON); Ob- 

 servatory Island near Staten Island, f. typica and f. circumscripta (SkottsBERG); 

 Falkland Islands: Berkeley Sound, Tort Louis, f typica. Hooker's Point, f typica 

 and f compacta (Skott.SBERG). 



3. Lithophyllum aequabile Fosl. 



Alg. Not. II (1906), p. 22; Lithophyllum di.sroideuiii f. «(^uabilis Fosl. \idcnsk. Selsk. 

 Aarsber. (Bot. Saml.) for 1904 (1905); tab. nostr. 2, lig. 6 — g. 



When this alga was for the first time met with, brought home from the South 

 Orkneys, I thought it had to be considered as a form of L. discoideum, with which 

 the small and feebly developed specimens known from the said locality are closely 

 connected. At the same time, however, I remarked that the form would perhaps 

 prove to represent an independent species also nearly approaching L. consociatum 

 from the Kerguelen. Afterwards, I have had the opportunity of examining a better 

 and richer material, partly brought home by Dr. Skottsberg from South Georgia 

 and from Louis Philip Land, partly by the French Antarctic Expedition Charcot 

 from the Wandel Island (collected by Br. Turquet), and kindly sent to me by Mr. 

 P. Hariot. Particularh' the specimens from the locality last mentioned show a 

 direction of varying which very nearly approaches L. consociatum. In treating of 

 the species last named,' I have also stated that this species and L. discoideum will 

 perhaps prove to represent forms of one and the same species, corresponding to 



M. FOSLIE. Die Lithothamnien der Gauss-Expedition (in press). 



