94 



My specimens seem to agree quite well with those of 



KJELLMAN. 



In a transverse section of the thallus (Fig. 98) it is seen that 

 the medullary layer consists of rather thin 

 filaments woven between each other; they 

 are of variable breath, their diameter being 

 12 16 fj. thick or even more. The supporting 

 cells at the periphery are mostly not much 

 developed; they are irregularly 3 4-gonal 

 (Figs. 99 and 100), up to 40 // in diameter. 

 They carry each a single or more rarely two 

 assimilating filaments, short or long. The short 

 ones (Fig. 99 b, Fig. 100) mostly consist of 

 three cells, someones only of two; the basal 

 cells are large, oval, about 60 70 // long and 

 40 {JL broad, the others smaller, the uppermost 

 have only a diameter about 27 p long. The 

 basal cells in the long assimilating filaments 

 (Fig. 99 a) have nearly the same size and 

 shape. The breadth of the cells in the cylin- 

 drical part of the filaments seem to vary 

 somewhat, in one specimen I found the dia- 

 meter to be about 16^, in another even 18 p.; 

 KJELLMAN states the diameter to be 15 //. The 



length of the cells is often more than double the breadth. 

 Regarding the habit of the plant the 



accompanying figure (Fig. 101) gives an idea. 



The plant is, as pointed out by KJELLMAN, 



large, about 16 cm high not much ramified 



with very long internodes and the branches 



spreading much and often somewhat recurved 



at the summits. It is evenly covered with 



hairs over the whole surface and of a reddish 



brown colour. 



This species has been found in deep 



water only clown to a depth of about 20 30 



meters. 



Fig. 99. Galaxaura 

 flagelliformis. a, ba- 

 sal part of long as- 

 similating hair, b, 

 short assimilating 

 filaments, one with 

 two cells, another 

 with three. (About 

 150:1). 



St. Jan: Off Hermitage and in several pla- 

 ces in the sound between this island and St. Tho- 

 mas. 



Geogr. Distrib. Florida, West Indies. 



Fig. 100. Galax- 

 aura flagelliformis 

 Kjellm. Short assi- 

 milating filament 

 with chromatp- 

 phore and pyrenoid 

 in the upper end 

 of the cell. (About 

 175: 1). 



