24 



The erect filaments reach 24 /j. and occasionally higher ; their 

 breadth is about 5 6 /. 



Fig. 15. Acrochsetium pulchellum nov. spec. 



Plant with monosporangia of which someones are emptied ; it creeps upon 



Chsetomorpha. (About 700 : 1). 



The sporangia are mostly terminally placed upon the erect 

 filaments ; more rarely sessile sporangia, placed immediately upon 

 the cells of the basal filaments are found. The sporangia are ovate, 



about 5 7 p. broad and 

 9 10 a long. 



This species has been 

 found upon Chsetomor- 

 pha antennina in a very 

 exposed place on rocky 

 coast. 



St. Croix: Northside. 



4. Acrochsetium netro- 

 carpum nov. spec. 



Thallus caespitosus 

 ad 400 // altus, e filis 

 repentibus et filis erectis 

 numerosis compositus. 

 Fila repentia ramosa, plus minus confluentia ex cellulis bre- 

 vibus irregulariter formatis constructa. 



Fig. 16. Acrochsetium pulchellum nov. spec. 

 Plant with hairs. (About 700 : 1). 



