Bd. IV: 5) ANTARCTIC AND SUBANTARCTIC CORALLINACE.'K. 7 



The species belongs to the sanie group as Lithotli. Philippii and seems to be 

 most closely connected with L. syiiauablastuvi from South Africa. It occurs in 

 the litoral region and has only been found in a single localit\- \\here it has likely 

 occurred in small numbers. 



Area: The Falkland Islands: Herkele)- Sound, Fort Louis; Stanlej' Harbour 

 (Skottsberg). 



5- Lithothamnion granuliferum Fosi,. 



Vidensk. Selsk. Aarsber. (Bot. Saml.) 1904 (1905); tab. nostr. i, flg. 10 — ii partim. 



Fronds crustlike, thin, at first almost circular, afterwards anastomosing to an 

 indefinite extent, developing wartlike or very short branchlike excrescences, 0.3 — 0.6 

 er up to I mm. in diameter. Conceptacles of sporangia disc-shaped, but little pro- 

 minent, crowded or in part confluent, 200 — 300 u in diameter. Sporangia bisporic, 

 50—60 /( long and 20 — 30 u broad. Conceptacles of c\stocarps convex or sub- 

 hemispheric-conical, 250 — 300 /< in diameter. 



Young specimens of this species are forming almost circular crusts, i — 2 cm. 

 in diameter and 0,2 — O.n mm. thick, hrml\- attached to the substratum, and with en- 

 tire or crenulate edge. \\'hen the crusts, in growing on, run together and converge, 

 small elevated ridges are frequently formed. Small excrescences are developed 

 mostl}- at a later stage of the development of the crust; thus crusts are found which 

 have attained a diameter of 2 cm., and still bear no trace of excrescences being 

 developed, while on the other band there are also smaller crusts provided with small 

 excrescences being in development. In older .specimens the excrescences are mostly 

 rather crowded, 0.3 — 0.6 mm., rarely up to i mm. thick. 



In a section of the crust, the cells of the hypothallium are forming long curves 

 upvvards, partl)- also short curves downwards, towards the substratum. The cells 

 are 11 — 30 /( long, 6— y n broad or about 2 — 4 times the diameter. The cells of 

 the perithallium are partly squarish or somewhat rounded, 5--8 /< in diameter, partly 

 vertically elongated, up to about 11 k, or exceptionally, 14 u long. 



The conceptacles of sporangia typicallj- developed are almost disc-shaped, but 

 slightly prominent, more or less crowded in the central parts of the crust, 200 — 

 250 /( in diameter, and the roof is perforated by 20 — 30 muciferous canals. They 

 can, however, grow up to 300 ji( in diameter, and theo approch the conceptacles of 

 Litlioth. magel/anicitm, towards maturity sometimes even slightly dcpressed in the 

 central part. I have seen no overgrown conceptacles. Those of cystocarps occur 

 in other individuals than those of sporangia. 



This species seems to be most closely connected with Litlioth. fumigatum from 

 the Southern Australia. On the other band, \oung specimens may be hardl)- distin- 



