4 M. FOSLIE. [1900 



I mentioned 1. c. a spedes under the name of L. proboscideum 

 from California, and considered at the same time some steril spe- 

 cimens from the west coast of Africa to be identic with the latter. 

 Through the kindness of Dr Bo met I got a large and well 

 developed specimen from the same place as the last named speci- 

 mens, Cape Verd, nere collected by Mr. Bouvier. This shows 

 that the African form is specifically distinct from the said Californian. 



The form truncata rather resembles the said L. proboscideum 

 in habit, but it is on the whole eoarser, with thicker branches. 

 Also in f. intermedia new formations are formed over the lower 

 and mostly dead parts of the plant. The branches are in this 

 form frequently longer than in f. truncata, partly terete and up 

 to about 5 mm. thick, partly upwards often compressed and ana- 

 stomosing, now and then almost palmate, or occasionally folded or 

 winded, nearly 3 mm. thick. On the one side it approaches Litho- 

 phyllum craspedium and on the other hand L. platyphyllum in habit. 



The conceptacles of sporangia are on a section about 200 by 

 100 /jl in diameter. Only emptied ones are knovvn. 



With reference to structure the species shows smaller cells 

 than in L. proboscideum. In a longitudinal section of a branch 

 the cells are in the central parts frequently twice as long as broad, 

 or 10 — 15 by 6 — 8 pi, getting smaller towards the periphery. 



The species is only known from the west coast of Africa, at 

 Cape Verd. Prof. Henriques.no. 23, and Mr. Bouvier. 



Lithophyllum Okamurai Fosl. mscr. 



Thallus at first forming up to 0.6 mm. thick crusts on small 

 stones or other hard objects which it at length surrounds. Fre- 

 quently in a somewhat advanced stage the crust issues partly 

 scattered partly at length rather crowded branches 3 — 5 mm. in 

 height and 1.5 — 2 mm. thick. These are either simple, subterete, 

 attenuating, obtuse, or, more frequently, angulate, scantily divided 

 or knotty, ' sometimes increasing in thickness upwards, depressed 

 in the centre and dentate, in all rather irregular and occasionalty 

 anastomosing even towards the apex. 



