Bd. IV: 5) ANTARCTIC AND SUBANTARCTIC CORALLINACE.t:. S 



.vhen growing upon an even substratum. PI. i, fig. i. It is, however, generally 

 more or less uneven, often with excrescences apparently wartlike; but as far as I 

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

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

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

 central part, 300 — 500 /( in diameter. 



The form- creiuilata is distinguished from the t)pical form particularh- by the 

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

 distinctly depressed in the central part, recalling Lithoth. foecitnduin. Besides, the 

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

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

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

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

 A small and feebh' developed crust on L. discoideiini from South Georgia probably 

 belongs to the same form. 



Litltotli. magcllanicuin occurs partly in the litoral region, partly and most!}' in 

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

 depth than of about 14 fathoms. Fertile specimens have been taken in January, 

 March and July. 



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

 BERG), Cape Horn (Michaelsen), Observatory Island near Staten Island (SkotT-S- 

 BERG); P"alklands: Berkeley Sound, Port Louis, and Hooker's Point (SkottsBERG); 

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



3- Lithothamnion fuegianum Fo.sl. 



Alg. Not. II (1906), ]j. g; Lithothamnion kerguelenum f. fuegiana Fosl. \'idensk. 

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



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

 älgä, growing on a decaying root, which, with some doubt, I referred to Lithoth 

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

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

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

 perhaps represents an independent species. .After examining some well developed 

 specimens from the Falkland Islands, I classified in Alg. Not. I. c. the alga as in- 

 dependent. 



The species forms irregular or semicircular crusts, 0.2 — O.e mm. thick, now loosely 

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

 expanded, scantily prolificating, shallowly lobed and undulate, with irregular surface 



