24 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



The erect filaments reach 24 /^ and occasionally higher ; their 

 breadth is about 5 — 6 fx. 



Fig. 15. Acrochætium pulchellum nov. spec. 



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



Chætomorpha. (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 fx broad and 

 9—10« long. 



This species has been 

 found upon Chætomor- 

 pha antennina in a very 

 exposed place on rocky 

 coast. 



St. Croix: Northside. 



4. Acrochætium netro- 

 carpiim nov. spec. 



Thallus cæspitosus 

 ad 400/^ altus, e filis 

 repentibus et fihs erectis 

 numerosis compositus. 

 Fila repentia ramosa, plus minus confluentia ex cellulis bre- 

 vibus irregulariter formatis constructa. 



Fig. 16. Acrochætium pulchellum nov. spec 

 Plant with hairs. (About 700 : 1). 



