Bd. IV: S) ANTARCTIC AND SUBANTARCTIC CORAI.UNACErE. 7 



The species belongs to the same group as LithotJi. Pliilippii and seems to be 

 most closel)- connected with L. synaiiablastiiiii from South Africa. It occurs in 

 the Htoral region and has only been found in a single localit\- where it has likel)- 

 occurred in small numbers. 



Area: The Falkland Islands: Berkele\' Sound, I'ort Louis; Stanley Harbour 

 (Skottsberg). 



5. Llthothamnion granuliferum Fosl. 



Vidensk. Selsk. Aarsber. (Bot. Saml.) 1904 (1905); tab. nostr. i, tig. 10 — 11 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 

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

 minent, crowded or in part confluent, 2CX3 — 300 f.t 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 — 0,6 mm. thick, firml)- attached to the substratum, and with en- 

 tire or crenulate edge. When the crusts, in growing on, run together and converge, 

 small elevated ridges are frequently formed. Small excrescences are developed 

 mosth' 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 hand there are also smaller crusts provided with small 

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

 rather crowded, o.; — 0.0 mm., rarely up to i mm. thick. 



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

 upwards, parth- also short curves downwards, towards the substratum. The cells 

 are 11—30 /i long, 6 — 9 u broad or about 2 — 4 times the diameter. The cells of 

 the perithallium are partly squarish or somewhat rounded, 5-8 11 in diameter, partly 

 vertically elongated, up to about 11 ti, or exceptionally, 14 » long. 



The conceptacles of sporangia typically 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 .(/ in diameter, and then approch the conceptacles of 

 Lithoth. magellanicmn, towards maturity sometimes even slightly depressed 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 Lit/ioth. finiiigatinii irom. 

 the Southern Australia. On the other hand, j-oung specimens may be hardl)' distin- 



