112 



Fig. 122. Gala.r- 

 aura occidenta- 

 lis nov. spec. 

 Papillae growing- 

 out into hya- 

 line hairs. 

 {About 370 : 1). 



papillae (Figs. 119 a, 120) protrude freely over the surface of the 



thallus and are not included in the chalk incrustation. In shape 

 they are clavate-cylindrical, having their largest 

 diameter a little above their middle and then 

 abruptly narrowed in, running out into a short 

 apiculus. They are about 40 p. long and 11 p 

 broad in their broadest part. They are provided 

 with a well developed chromatophore (Fig. 120), 

 parietal, cuplike, with thin prolongations along 

 the wall of the cell ; in the middle a pyre- 

 noid is present. Occasionally I have found 

 1 2 small cells at the summit of the papillae 

 which is then rounded and very rarely the up- 

 per cell was also growing out to a long one- 

 celled hair richly filled with protoplasm at the 

 upper end (Fig. 122). 



Antheridial conceptacles (Fig. 123) were pre- 

 sent in great numbers. They occur in the young 



internodes and are nearly spherical bodies with an opening 



through the wall of the thallus. Their wall consists of ramified 



filaments with larger cells growing closely together. From the 



innerside of these the richly 



ramified antheridia pro- 

 ducing filaments grow up 



in the cavity. The anthe- 



ridial filaments are divided 



into small cells of which 



those at the apex (but 



later on also the other 



cells) are transformed into 



mother-cells for the sper- 



matia. The antheridia are 



about 8 JJL long and 5 // 



broad, oval. The anthe- 



ridial conceptacles have 



mostly a diameter of about 



200300 n but larger ones 



also occur. 



To the sectio Vepre- 



culx KJELLMAN only refers four species none of which are from 



the West Indies. Of these G. veprecula Kjellm. seems to come 



very near to my plant. I have been able te compare my plant 



Fig. 123. Galaxaura occidentalis nov. spec. 

 Transverse section of anantheridial con- 

 ceptacles. (About 200 : 1). 



