182 



As to the last mentioned plant this was already known to 

 me from the description of Chn. jastigiata by Mrs. Gepp^). And 

 further I have been able to examine Chn. implexa by the kind- 

 ness of M™^ Weber. Even if these species are nearly related 

 to Rosenvingea, it is to be remarked on the other hand that as 

 I shall mention later on in more detail, they, especially Chn. 

 fastigiata, differ so much from it, that they can not be referred 

 to a common genus. 



With the above mentioned Asperococcus species the case is 

 quite different. The species in question are : Asperococcus orien- 

 talis J. Ag., Asperococcus intricatus J. Ag. and Asperococcus fastigi- 

 atus Zanard. Here the correspondence is so great that there can 

 be no doubt that they must be very closely related to my plant 

 and therefore I have not hesitated to refer these species to 

 Rosenvingea. 



Nearest related to my plant seems to be Rosenvingea orien- 

 talis. It was originally described by J. Agardh in "Spec. Gen. 

 et Ord. Alg.", vol. I, 1848, p. 78 and has later on been referred 

 to Encoelium by Kutzing (,,Spec.", p. 551) and to Hydroclathrus 

 by Heydrich in "Hedwigia", vol. 33, 1894. 



From Professor Kuckuck I obtained for comparison with my 

 plant drawings and preparations. Judging from these Rosenvingea 

 orientalis differs essentially by the absence of hairs, further the 

 sporangia and the cells on the whole seem to be somewhat 

 smaller. As I wished very much also to see the habit of the 

 plant I asked M«i® Weber to allow me to see her specimens 

 from the Indian Ocean and she most kindly sent me all her dried 

 material of this species to examine. These differ from my plant 

 in their more slender thallus, especially the ends of the branches 

 which are nearly hairlike ; on the other hand the plant has more 

 than the double height of the mine and it is more richly branched. 



Of Rosenvingea intricata I have had a collection of dried 

 original specimens from Vera Cruz, collected by Liebmann and 

 determined by J. Agardh, further a dried specimen collected at 

 Barbadoes by M"^ Vickers and material in spirit collected during 

 the "Siboga"-Expedilion, which M™^ Weber- van Bosse has most 

 kindly lent to me. 



It is described by J. Agardh in "Alg. Liebm.", p. 7 and in 

 "Species Alg.", I, p. 77. Kutzing in "Species Alg.", p. 551 calls 

 it Encoelium intricalum and gives a good figure of it in "Tab. 



') E. S. Barton, On the Fruit of Chnoospora fastigiata, J. Ag. in Journal 

 of the Linnean Society, vol. XXXIIl, 1898, p. 507. 



