The Dasvcladaceae of the Danish West Indies. 



By 

 F. Borgesen. 



1 he following treatise comprehends the species of Dasycladacece 

 hitherto found in my material of algse collected during my three 

 sojourns at the West Indies. 



In the arrangement of the genera I follow the system of Olt- 

 manns in his "Morphologie und Biologie der Algen". 



I. Dasycladeae. 



Neomeris Lamouroux. 



N. annulata Dickie. 



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

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

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

 Neomeris Kelleri Cramer , Ueber die verticillirten Siphoneen besonders 

 Neomeris und Cymopolia (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*/a 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. annul ata Solms (I.e. 

 p. 71) gives the length to be 140 fj. and the breadth 65 — 70 fi 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 (i long and 



