THE CODIACEAE OF THE SIBOGA EXPEDITION 



including a Monograph of FLABELLARIEAE and UDOTEAE 



BY 



A. & E. S. GEPP, 



London. 



W i t h 22 p 1 a t e s. 



GENERAL INTRODUCTION. 



The basis upon which this paper is founded is the collection of Codiaceae, made by 

 Madame Weber van Bosse duiïng the Siboga Expedition to the East Indian Archipelago in 

 1899 and 1900, and kindly entrusted by her to us for examination. No less than nine genera 

 of Codiaceae are represented in that region — namely, Chlor odesmis, Avrainvillea, Rhipilia, 

 Penicillus, Boodleopsis (nov. gen.), Tydemania, Udotca, Codium, Halimcda. Some of the plants 

 were difficult to determine, partly owing to the disappearance or inaccessibility of type specimens, 

 and partly because some of the genera had been built up piecemeal and thrown into confusion 

 by the addition of species which either did not really belong to the genus or were not easily 

 distinguishable from species previously existing but insufficiently defined. Where this has been 

 the case we have been compelled to make a complete study of the respective genera, and to 

 include therein our determinations of the Siboga specimens. 



Thus, inter alia, have we treated Chlorodesmis, Avrainvillea, Rhipilia, Penicillus, 

 Tydemania and Udotea ; while Halimeda has already been monographed in a separate paper 

 in 1901 (Siboga-Expeditie Monogr. LX). 



The Siboga collection of Codiaceae provided two new genera, Tydemania Web. v. Bosse 

 (Ann. Jard. Bot. Buitenzorg 2 e sér., vol. II, i90i,p. 139) and Boodleopsis, and nine new species 

 and one variety: — Rhipilia orientalis, Boodleopsis 'siphonacea, Tydemania expeditiofiisWeb.v. 



SIBOGA-EXPEDITIE LXII. I 



548itë 



