The Dasycladaceæ of the Danish West Indies. 



By 



F. Børgesen. 



The following treatise comprehends the species of Dasycladaceæ 

 hitherto found in my material of algæ collected during my three 

 sojourns at the West Indies. 



In the arrangement of the genera I follow the system of 0 1 1- 

 manns in his ''Morphologie und Biologie der Algen". 



I. Dasycladeæ. 



Neomeris Lamouroux. 

 N. annulata Dickie. 



Dickie, On the Algæ of Mauritius (Journal Linnean Society, vol. 14 

 p. 198). H. Solms-Laubach, Ueber die Algengenera Gymopolia, Neomeris 

 und Bornetella (Ann. du Jardin bot. de Buitenzorg, Vol. XI. 1893). 

 Neomeris Kelleri Cramer, Ueber die verticillirten Siphoneen besonders 

 Neomeris und Gymopolia (Neue Denkschrift, der Schweiz, naturf. Gesell- 

 schaft, Bd. XXX, 1887), and Ueber die verticillirten Siphoneen besonders 

 Neomeris und Bornetella (Neue Denkschriften, Bd. 32, 1890). 



Besides the typical form, which I have collected in great quan- 

 tities, I have found a few specimens which in the form and size 

 of the sporangia show some difference. The sporangia were namely 

 cylindrical about 2 L /2 times as long as broad with the apex obtuse, 

 rounded (see Fig. Id). The spore was about 190// long and 70// 

 broad. As to the size of the spores of N. annulata Solms (1. c. 

 p. 71) gives the length to be 140// and the breadth 65 — 70 // and 

 these dimensions agree very well with those of the common typical 

 form. But sometimes also other sizes are to be found, in one 

 specimen e. g. the dimensions of the spores were 160 p long and 



