64 



much search I have not succeeded in finding antheridia; occasionally 

 some decayed fragments of what perhaps might be remains of anthe- 

 ridia were found at the tips of the filaments, but it seems to me 

 very doubtful what they really were. Most probably the specimens 

 are dioecious in accordance with what ROSENVINGE (1. c. p. 146) 

 has stated to be commonly thecase with Nemalion multifidum in 

 the Danish waters. I have never seen spermatia in contact with 

 the trichogyne. 



Nearly, all the material at hand was found in this stage of 

 development. In the youngest tips of the plant only were no 

 carpogonial branches yet developed. After much search and by 

 taking samples in different parts of the dried material I have 

 however found a few cystocarps of which fig. 65 D illustrates one. 

 If these are normally constructed, the sporogenous filaments seem 

 to be more loosely connected than those in Nemalion multifidum. 

 The carpospores are about 11 /j. broad. 



This species was found in shallow water fixed to stones and 

 shells near the shore. The locality was rather sheltered; but 

 nevertheless small waves occur by which the plant was moved to 

 and fro. 



Only collected once in the month of February on the south coast of 

 St. Croix: at Long Point. 



Geogr. Distrib. : West Indies. 



2. Nemalion longicolle B0rgs. 



B0RGESEN, F., Some new or little known West Indian Florideee, I. 

 (Botanisk Tidsskrift vol. 30, 1909, p. 8, pi. 2j. 



This species was growing together with the preceding one 

 which it very much resembled in colour and outer habit. For 

 this reason I did not observe when collecting the plant that it 

 was different from N. Schrammi and I have therefore unfortun- 

 ately not preserved it in any other form than dried. 



It was only during the microscopical examination here in 

 Copenhagen that it became clear that my material contained two 

 forms and after having arranged them in accordance with the 

 different microscopical characters they then showed quite plainly 

 a difference in habit also. 



Thus the specimens (1. c., plate 2) when compared with N. 

 Schrammi were found to be more slender, the thickest branches 

 being 5 7 mm thick. They were richly subdichotomously or 

 laterally ramified and the thallus had not the crisp folded sur- 

 face to be found in N. Schrammi. The colour of the dried spec- 



