Some Chlorophyceæ 

 from the Danish West Indies. II. 



By 



F. Børgesen. 



Valonia Ginn. 



Valonia ventricosa J. Ag. 



J. Agardh, Till Algernes Systematik. VIII. Siphoneæ. p. 96. 



This species described from specimens from St. Croix collected 

 by Ørsted was already found there in the beginning of the nine- 

 teenth century by West, who called the plant Ulva vesicaria. 

 Beautiful specimens collected by him are found in Vahl's Herba- 

 rium in the Botanical Museum, Copenhagen, but so far I know no 

 description of the species from that time was published. 



In "Hydrophytologia Danica", Lyngbye p. 72 mentions these 

 specimens: "Ad insulas Færoenses non nisi parvæ evadunt, sed 

 exemplaria vidi in herbario cel. Vahlii, ex insula St. Crucis, allata, 

 quæ ovum columbinum magnitudine exsuperant". Lyngbye 

 referred this species to his Gastridium ovale (= Halicystis ovalis 

 Aresch.) and C. Agardh in "Species", p. 431, also refers the speci- 

 mens from St. Croix mentioned by Lyngbye to Valonia ovalis 

 and as belonging to this species it is also found in later authors 

 until J. Agardh described it as above quoted. 



The morphological and anatomical organisation of Valonia 

 ventricosa has been described by Murray in "Phycological Me- 

 moirs", p. 50 and shortly by Kuckuck in Bot. Zeitung 1907. 



As already mentioned by Lyngbye the thallus of Valonia 

 ventricosa can reach a size of a pigeon's egg, Murray says even 

 that of a hen and some of the specimens I have found myself also 

 came near in size to small hens' eggs. 



Botanisk Tidsskrift. 32. Bind. 16 



