6 M. FOSLIE. [1900 



stem as yet was not thorougly worked. Therefore it also in part 

 was based only upon the development of the sporangia, but in 

 distribution of the species in List of Lith. 1 ) due consideration was 

 given to the carpospores, as I perceived the divergences in the 

 development of the sporangia partly to correspond with a diver- 

 gence in the development of the other organs which less frequently 

 occur. 



The genus Lithophyllym is in the said Syst. Surv. tåken in 

 quite another sense than formerly (also otherwise than in Mr. 

 Heydriclis last system) by which little but the name remains. 

 Almost all species formerly subsumed under this genus are to be 

 included under Lithothamnion. Also the type of the genus in an 

 earlier sense, L. liclienoicles, is to be ranked with Lithothamnioti, 

 as already made before, while on the other hand the earlier type 

 of Lithothamnioyi, L. fasciculatum, must be included under Li- 

 tliophyllum. 



ln the following revised survey of Melobesieae 2 ) as far as the 

 reproductive organs are concerned, only sporangia and carpospores 

 are referred to. The antheridia are as yet only known in the case 

 of cumparatively fevv species. In some genera these organs show 

 a uniform development, in others on the contrary a divergent one, 

 but this divergence seems as above indicated to correspond with 

 a similar divergence in the other organs and will hardly have an 

 influence upon the systematism. In a great number of species, 

 however, only one kind of reproductive organs is known. 



I find it unnecessary in this short survejf to include thallus 

 in the diagnoses of the genera. 



The present survey differs somewhat from my earlier one, 

 but chiefly only with regard to the genus Goniolithon , the limit of 

 which has been modified. The subgenus Lepidomorphum realty 

 is found to be closely related to LitJiopJiyllum and therefore sub- 

 sumed under the latter. Whether Lepidomorphum is to be con- 



a ) M. Foslie, List of Species of the Lithothamnia. Det kg!, norske Viden- 

 skabers Selskabs Skrifter. 1898. No. 3. Trondhjem 1898. 



2 ) With exception of MastbpJwra ; but exclusive Schmitsiella which in my 

 opinion is not referrible to this section of Corallinaceae. 



