Bd. IV: 5) ANTARCTIC AND SUBANTARCTIC CORALLTNACE.E. 5 



Alien growing upon an even substratuni. PI. i, fig. i. It is, liowever, generally 

 more or less uneven, often with e.xcrescences apparently wartlike; but as far a.s I 

 have hitherto seen, the latter have only risen from the overgrouth of foreign bodies. 

 PI. I, fig. 2 — 3. It develops conceptacles of sporangia which are partly convex, 

 partly almost disc-shaped, but little prominent, sometimes feebly depressed in the 

 central part, 300 — 500 u in diameter. 



The form cremdata is distinguished from the tvpical form particuiarl\- by the 

 roof of the conceptacles of sporangia being towards maturity as a general rule 

 distinctly depressed in the central part, recalling Litkotli. foeciindinn. Besides, the 

 cystocarpic conceptacles seem to be lower than usual in well developed specimens 

 of L. niagellanicuiii. It may represent an independent species, but as I cannot at 

 present point out any definite line, I must provisionally consider it as a form of L. 

 magellauicum. Typical specimens of this form are known from the South Orkneys. 

 A small and feebly developed crust on L. discoideuin from South Georgia probably 

 belongs to the same form. 



Lithoth. niagellaniciini occurs parth- in the litoral region, partly and mostly in 

 the Upper part of the sublitoral region, and has not been met with at a greater 

 depth than of about 14 fathoms. F"ertile specimens have been taken in January, 

 March and July. 



Area: Patagonia; Straits of Magellan ; Fuegia: Beagle Channel: Ushuaia (Skotts- 

 BERG), Cape Hörn (Michaelsen), Observatory Island near Staten Island (Skott.s- 

 berg); Falklands: Berkeley Sound, Port Louis, and Hooker's Point (Skottsberg); 

 South Georgia (SkottsBERG); South Orkneys, f. cremt lata ("Scotia"). 



^■ Lithothamnion fuegianum Iosl. 



Alg. Not. II (1906). ji. 9; Lithothamnion kerguelenum f. fuegiana Fosl. \'idensk. 

 Selsk. Aaisber. (Bot. .saml.) for 1904 (1905); tab. nostr. i, fig. 4 — 6. 



In Calc. Alg. Fuegia p. 69 l mentioned a fragmentary specimen of a calcareous 

 alga, growing on a decaying root, which, with some doubt, I referred to Litlioth 

 kerguelenwn. Afterwards I preliminarily classified (1. c.) this form as a denominated 

 form of the said species. In treating of the type specimen of L. kcrgitelenuni pic- 

 tured in "Die Lithothamnien der Gauss-Expedition", I remarked that f. fuegiana 

 perhaps repre.sents an independent species. .\fter examining some well developed 

 specimens from the F"alkland Islands, I classified in .Mg. Xot. 1. c. the alga as in- 

 dependent. 



The species forms irregulär or semicircular crusts, o.^ — o.n mm. thick, now loosely 

 clinging, now but partially attached to decajing roots and more or less horizontally 

 expanded. scantily prolificating, shallowly lobed and undulate, with irregulär surface 



